Xamarin.forms: System.NotSupportedException: Unable to activate instance of type Xamarin.Forms.Platform.Android.XXXRenderer from native handle

[paleicikas]

Basic Information

• Version with issue: Latest
• Affected Platform: Android (versions from log: 5.0 - 8.0)

Log

Xamarin Exception Stack:
System.NotSupportedException: Unable to activate instance of type Xamarin.Forms.Platform.Android.ScrollViewRenderer from native handle 0xffb1b1cc (key_handle 0x5bbb241).
  at Java.Interop.TypeManager.CreateInstance (System.IntPtr handle, Android.Runtime.JniHandleOwnership transfer, System.Type targetType) [0x0017d] in <263adecfa58f4c449f1ff56156d886fd>:0
  at Java.Lang.Object.GetObject (System.IntPtr handle, Android.Runtime.JniHandleOwnership transfer, System.Type type) [0x000b9] in <263adecfa58f4c449f1ff56156d886fd>:0
  at Java.Lang.Object._GetObject[T] (System.IntPtr handle, Android.Runtime.JniHandleOwnership transfer) [0x00017] in <263adecfa58f4c449f1ff56156d886fd>:0
  at Java.Lang.Object.GetObject[T] (System.IntPtr handle, Android.Runtime.JniHandleOwnership transfer) [0x00000] in <263adecfa58f4c449f1ff56156d886fd>:0
  at Java.Lang.Object.GetObject[T] (System.IntPtr jnienv, System.IntPtr handle, Android.Runtime.JniHandleOwnership transfer) [0x00006] in <263adecfa58f4c449f1ff56156d886fd>:0
  at Android.Views.View.n_OnDetachedFromWindow (System.IntPtr jnienv, System.IntPtr native__this) [0x00000] in <263adecfa58f4c449f1ff56156d886fd>:0
  at (wrapper dynamic-method) System.Object.f6b7326d-602e-4d8c-83ea-a38d8b496124(intptr,intptr)
--- End of inner exception stack trace ---
  System.MissingMethodException: No constructor found for Xamarin.Forms.Platform.Android.ScrollViewRenderer::.ctor(System.IntPtr, Android.Runtime.JniHandleOwnership)
    at Java.Interop.TypeManager.CreateProxy (System.Type type, System.IntPtr handle, Android.Runtime.JniHandleOwnership transfer) [0x00054] in <263adecfa58f4c449f1ff56156d886fd>:0
    at Java.Interop.TypeManager.CreateInstance (System.IntPtr handle, Android.Runtime.JniHandleOwnership transfer, System.Type targetType) [0x00111] in <263adecfa58f4c449f1ff56156d886fd>:0
  --- End of inner exception stack trace ---
    Java.Interop.JavaLocationException: Exception of type 'Java.Interop.JavaLocationException' was thrown.
      at Java.Lang.Error: Exception of type 'Java.Lang.Error' was thrown.
      at java.lang.Error: Java callstack:
      at md51558244f76c53b6aeda52c8a337f2c37.ScrollViewRenderer.n_onDetachedFromWindow(Native Method)
      at md51558244f76c53b6aeda52c8a337f2c37.ScrollViewRenderer.onDetachedFromWindow(ScrollViewRenderer.java:91)
      at android.view.View.dispatchDetachedFromWindow(View.java:16769)
      at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:3428)
      at android.view.ViewGroup.removeAllViewsInLayout(ViewGroup.java:5153)
      at android.view.ViewGroup.removeAllViews(ViewGroup.java:5099)
      at md5f493dec2f3f35774ee989aaa40ef64fd.MainActivity.n_onCreate(Native Method)
      at md5f493dec2f3f35774ee989aaa40ef64fd.MainActivity.onCreate(MainActivity.java:44)
      at android.app.Activity.performCreate(Activity.java:6955)
      at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1126)
      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2927)
      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3045)
      at android.app.ActivityThread.-wrap14(ActivityThread.java)
      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1642)
      at android.os.Handler.dispatchMessage(Handler.java:102)
      at android.os.Looper.loop(Looper.java:154)
      at android.app.ActivityThread.main(ActivityThread.java:6776)
      at java.lang.reflect.Method.invoke(Native Method)
      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1496)
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1386)

[kingces95]

@paleicikas If you could attach a reproduction, we'd appreciate it.

[PureWeen]

@paleicikas is the scrollview part of a listview at all?

[paleicikas]

The same with MasterDetailPageRenderer, thousands of:

System.NotSupportedException: Unable to activate instance of type Xamarin.Forms.Platform.Android.AppCompat.MasterDetailPageRenderer from native handle 0x8090001d (key_handle 0x423b7250).
  at Java.Interop.TypeManager.CreateInstance (System.IntPtr handle, Android.Runtime.JniHandleOwnership transfer, System.Type targetType) [0x0017d] in <263adecfa58f4c449f1ff56156d886fd>:0
  at Java.Lang.Object.GetObject (System.IntPtr handle, Android.Runtime.JniHandleOwnership transfer, System.Type type) [0x000b9] in <263adecfa58f4c449f1ff56156d886fd>:0
  at Java.Lang.Object._GetObject[T] (System.IntPtr handle, Android.Runtime.JniHandleOwnership transfer) [0x00017] in <263adecfa58f4c449f1ff56156d886fd>:0
  at Java.Lang.Object.GetObject[T] (System.IntPtr handle, Android.Runtime.JniHandleOwnership transfer) [0x00000] in <263adecfa58f4c449f1ff56156d886fd>:0
  at Java.Lang.Object.GetObject[T] (System.IntPtr jnienv, System.IntPtr handle, Android.Runtime.JniHandleOwnership transfer) [0x00006] in <263adecfa58f4c449f1ff56156d886fd>:0
  at Android.Views.View.n_OnDetachedFromWindow (System.IntPtr jnienv, System.IntPtr native__this) [0x00000] in <263adecfa58f4c449f1ff56156d886fd>:0
  at (wrapper dynamic-method) System.Object.97b97cd4-2244-4eef-9889-8324d358cfb8(intptr,intptr)
--- End of inner exception stack trace ---
  System.MissingMethodException: No constructor found for Xamarin.Forms.Platform.Android.AppCompat.MasterDetailPageRenderer::.ctor(System.IntPtr, Android.Runtime.JniHandleOwnership)
    at Java.Interop.TypeManager.CreateProxy (System.Type type, System.IntPtr handle, Android.Runtime.JniHandleOwnership transfer) [0x00054] in <263adecfa58f4c449f1ff56156d886fd>:0
    at Java.Interop.TypeManager.CreateInstance (System.IntPtr handle, Android.Runtime.JniHandleOwnership transfer, System.Type targetType) [0x00111] in <263adecfa58f4c449f1ff56156d886fd>:0
  --- End of inner exception stack trace ---
    Java.Interop.JavaLocationException: Exception of type 'Java.Interop.JavaLocationException' was thrown.
      at Java.Lang.Error: Exception of type 'Java.Lang.Error' was thrown.
      at java.lang.Error: Java callstack:
      at md58432a647068b097f9637064b8985a5e0.MasterDetailPageRenderer.n_onDetachedFromWindow(Native Method)
      at md58432a647068b097f9637064b8985a5e0.MasterDetailPageRenderer.onDetachedFromWindow(MasterDetailPageRenderer.java:60)
      at android.view.View.dispatchDetachedFromWindow(View.java:13392)
      at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:2793)
      at android.view.ViewGroup.removeAllViewsInLayout(ViewGroup.java:4236)
      at android.view.ViewGroup.removeAllViews(ViewGroup.java:4180)
      at md51558244f76c53b6aeda52c8a337f2c37.FormsAppCompatActivity.n_onDestroy(Native Method)
      at md51558244f76c53b6aeda52c8a337f2c37.FormsAppCompatActivity.onDestroy(FormsAppCompatActivity.java:80)
      at android.app.Activity.performDestroy(Activity.java:5623)
      at android.app.Instrumentation.callActivityOnDestroy(Instrumentation.java:1123)
      at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:3693)
      at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:3724)
      at android.app.ActivityThread.access$1500(ActivityThread.java:169)
      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1330)
      at android.os.Handler.dispatchMessage(Handler.java:102)
      at android.os.Looper.loop(Looper.java:136)
      at android.app.ActivityThread.main(ActivityThread.java:5476)
      at java.lang.reflect.Method.invokeNative(Native Method)
      at java.lang.reflect.Method.invoke(Method.java:515)
      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
      at dalvik.system.NativeStart.main(Native Method)

Sorry, the is not way attach a reproduction (to much logic).

[paleicikas]

@PureWeen no, scrollview not used in listview (header or footer)

[PureWeen]

@paleicikas if you could create a repro or give more info that would be helpful

From the looks of it you're disposing of the MasterDetailsPAge for some reason. Swapping out Main page? Other? I need a basic repro or additional info to go much further with this

My other suggestion would be to try out the nightly build that just went out today (7/17)
https://blog.xamarin.com/try-the-latest-in-xamarin-forms-with-nightly-builds/

There's a number of fixes there with MDP related to swapping pages out so we can see if that one resolves it for you

[tekinc]

Anyone have any work around for this?

[samhouts]

@tekinc We've been unable to pinpoint the cause as of yet, since we do not have a project that reproduces the problem. Do you have a sample project you can share? Thank you!

[pauldipietro]

Due to a lack of updates or comments for over 30 days, this will be closed. Please reopen this with a sample project as requested if the issue still occurs with the latest stable/nightly release of Forms. Thanks!

[PureWeen]

Just a quick note @paleicikas sent me a project privately that he's working with me on to see if I can recreate.

That being said if anyone can create a repro for this here that would be great!

[radioactiveman]

Is there any update on this issue?
Our app is also affected according to crash reports. But we found no way to reproduce it.
Maybe it happens when the app is resumed from the background after a long time slot?

• No scrollview inside a listview
• No master detail pages
• Xamarin.Forms 3.3.0.967583
• Android SDK 27

[eschragw]

I see this issue when I have a scrollview in a child page. When I background the app and then resume the app, the app will crash with that error. I can consistently replicate this issue in our main app. If you need more info, I can try to replicate it in a smaller project to provide as a sample.

[PureWeen]

@eschragw if you can that would be really helpful!

I've tried to recreate this one but haven't had any luck as of yet

[radioactiveman]

@eschragw Are you using MvvmCross in your project by any chance?

[eschragw]

@PureWeen @radioactiveman I am using MvvmCross. My error when away when I corrected my app from having NoHistory set to true. The page with the scrollview was on a modal view. Things have gotten hectic, so I have not been able to create a sample project. I might be able to get to it this if you guys are weren't able to repro.

[Mustafa7070]

i have same problem her:
"System.NotSupportedException: Unable to activate instance of type Xamarin.Forms.Platform.Android.ImageButtonRenderer from native handle... "

Android: 8.1.0 Android Build: OPM1.171019.026 Manufacturer: OPPO Model: RMX1811

[PureWeen]

@Mustafa7070 do you have a reproduction or an app you can provide so I can see and fix the issue?

[Mustafa7070]

@PureWeen ok , i will ask my manager
and here is the view where i am using ImageButton

https://drive.google.com/file/d/1Rk8BxYUV7u-C-ElUa0lk1z7DOSFxRpZt/view?usp=sharing

[lassana]

Does anyone know a workaround for this?

[PureWeen]

@lassana the cases for this vary a lot. It's similar to only having a NullReferenceException. There isn't really a core issue this comes from. If you have a repro of your scenario and can open a new issue we can look at fixing it for your particular case

[lassana]

@PureWeen thanks for replying! I've got 100% reproducible sample. Creating a new issue...

[lassana]

I created https://github.com/xamarin/Xamarin.Forms/issues/5894 with a repro.

[Monikaprime]

09-18 19:40:51.549 W/prime.craftdev(26714): Accessing hidden method Landroid/view/View;->getTransitionAlpha()F (light greylist, reflection)
09-18 19:40:51.576 W/prime.craftdev(26714): Accessing hidden method Landroid/text/SpannableStringInternal;->length()I (light greylist, JNI)
09-18 19:40:51.618 W/prime.craftdev(26714): Accessing hidden field Landroid/view/View;->mViewFlags:I (light greylist, reflection)
09-18 19:40:51.621 W/prime.craftdev(26714): Accessing hidden method Landroid/view/View;->setTransitionAlpha(F)V (light greylist, reflection)
09-18 19:40:51.623 W/prime.craftdev(26714): Accessing hidden method Landroid/view/ViewGroup;->suppressLayout(Z)V (light greylist, reflection)
09-18 19:40:51.626 W/prime.craftdev(26714): Accessing hidden method Landroid/view/View;->setLeftTopRightBottom(IIII)V (light greylist, reflection)
09-18 19:40:52.809 W/StaticLayout(26714): maxLineHeight should not be -1. maxLines:1 lineCount:1
09-18 19:40:52.904 I/chatty (26714): uid=10149(prime.craftdev) identical 2 lines
09-18 19:40:52.919 W/StaticLayout(26714): maxLineHeight should not be -1. maxLines:1 lineCount:1
09-18 19:40:53.628 W/StaticLayout(26714): maxLineHeight should not be -1. maxLines:1 lineCount:1
09-18 19:40:53.630 W/StaticLayout(26714): maxLineHeight should not be -1. maxLines:1 lineCount:1
09-18 19:40:53.755 I/prime.craftdev(26714): Explicit concurrent copying GC freed 14428(773KB) AllocSpace objects, 21(420KB) LOS objects, 49% free, 3MB/6MB, paused 71us total 22.912ms
09-18 19:40:53.758 D/Mono (26714): GC_TAR_BRIDGE bridges 317 objects 25456 opaque 11374 colors 317 colors-bridged 317 colors-visible 317 xref 6 cache-hit 0 cache-semihit 0 cache-miss 0 setup 0.10ms tarjan 11.07ms scc-setup 0.07ms gather-xref 0.01ms xref-setup 0.00ms cleanup 1.05ms
09-18 19:40:53.758 D/Mono (26714): GC_BRIDGE: Complete, was running for 26.54ms
09-18 19:40:53.758 D/Mono (26714): GC_MINOR: (Nursery full) time 21.86ms, stw 23.11ms promoted 1276K major size: 16176K in use: 8102K los size: 7168K in use: 4265K
09-18 19:40:53.991 W/View (26714): requestLayout() improperly called by md51558244f76c53b6aeda52c8a337f2c37.ScrollViewContainer{c47a171 V.E...... ......ID 0,0-1080,843} during layout: running second layout pass
09-18 19:40:54.026 W/View (26714): requestLayout() improperly called by md58432a647068b097f9637064b8985a5e0.NavigationPageRenderer{2d32db1 V.E...... ......I. 0,0-1080,1947 #8a5} during second layout pass: posting in next frame
09-18 19:40:54.898 W/View (26714): requestLayout() improperly called by md51558244f76c53b6aeda52c8a337f2c37.ScrollViewContainer{ae18e41 V.E...... ......ID 0,0-1080,843} during layout: running second layout pass
09-18 19:40:54.933 W/View (26714): requestLayout() improperly called by md58432a647068b097f9637064b8985a5e0.NavigationPageRenderer{2d32db1 V.E...... ........ 0,0-1080,1947 #8a5} during second layout pass: posting in next frame
09-18 19:40:55.111 W/StaticLayout(26714): maxLineHeight should not be -1. maxLines:1 lineCount:1
09-18 19:40:55.112 I/chatty (26714): uid=10149(prime.craftdev) identical 1 line
09-18 19:40:55.138 W/StaticLayout(26714): maxLineHeight should not be -1. maxLines:1 lineCount:1
09-18 19:40:55.714 I/prime.craftdev(26714): Explicit concurrent copying GC freed 7814(523KB) AllocSpace objects, 6(120KB) LOS objects, 50% free, 3MB/7MB, paused 76us total 25.729ms
09-18 19:40:55.717 D/Mono (26714): GC_TAR_BRIDGE bridges 290 objects 34986 opaque 15069 colors 290 colors-bridged 290 colors-visible 290 xref 3 cache-hit 0 cache-semihit 0 cache-miss 0 setup 0.11ms tarjan 13.84ms scc-setup 0.06ms gather-xref 0.01ms xref-setup 0.03ms cleanup 1.62ms
09-18 19:40:55.717 D/Mono (26714): GC_BRIDGE: Complete, was running for 29.74ms
09-18 19:40:55.717 D/Mono (26714): GC_MINOR: (Nursery full) time 24.38ms, stw 26.02ms promoted 1300K major size: 16176K in use: 9512K los size: 15360K in use: 11853K
09-18 19:40:55.753 W/StaticLayout(26714): maxLineHeight should not be -1. maxLines:1 lineCount:1
09-18 19:40:55.754 W/StaticLayout(26714): maxLineHeight should not be -1. maxLines:1 lineCount:1
09-18 19:40:55.758 W/View (26714): requestLayout() improperly called by md51558244f76c53b6aeda52c8a337f2c37.ScrollViewContainer{37c0fb3 V.E...... ......ID 0,0-1080,843} during layout: running second layout pass
09-18 19:40:55.774 W/StaticLayout(26714): maxLineHeight should not be -1. maxLines:1 lineCount:1
09-18 19:40:55.787 W/View (26714): requestLayout() improperly called by md58432a647068b097f9637064b8985a5e0.NavigationPageRenderer{2d32db1 V.E...... ........ 0,0-1080,1947 #8a5} during second layout pass: posting in next frame
09-18 19:40:56.320 W/StaticLayout(26714): maxLineHeight should not be -1. maxLines:1 lineCount:1
09-18 19:40:56.321 W/StaticLayout(26714): maxLineHeight should not be -1. maxLines:1 lineCount:1
09-18 19:40:56.325 W/View (26714): requestLayout() improperly called by md51558244f76c53b6aeda52c8a337f2c37.ScrollViewContainer{e5f52c9 V.E...... ......ID 0,0-1080,843} during layout: running second layout pass
09-18 19:40:56.346 W/StaticLayout(26714): maxLineHeight should not be -1. maxLines:1 lineCount:1
09-18 19:40:56.356 W/View (26714): requestLayout() improperly called by md58432a647068b097f9637064b8985a5e0.NavigationPageRenderer{2d32db1 V.E...... ........ 0,0-1080,1947 #8a5} during second layout pass: posting in next frame
09-18 19:40:56.676 D/Mono (26714): GC_BRIDGE waiting for bridge processing to finish
09-18 19:40:56.704 I/prime.craftdev(26714): Explicit concurrent copying GC freed 7677(503KB) AllocSpace objects, 3(60KB) LOS objects, 50% free, 3MB/7MB, paused 110us total 25.732ms
09-18 19:40:56.708 D/Mono (26714): GC_TAR_BRIDGE bridges 845 objects 925 opaque 126 colors 845 colors-bridged 845 colors-visible 845 xref 50 cache-hit 0 cache-semihit 0 cache-miss 0 setup 0.16ms tarjan 0.51ms scc-setup 0.39ms gather-xref 0.03ms xref-setup 0.08ms cleanup 0.21ms
09-18 19:40:56.708 D/Mono (26714): GC_BRIDGE: Complete, was running for 32.47ms
09-18 19:40:56.708 D/Mono (26714): GC_MAJOR: (LOS overflow) time 46.49ms, stw 49.14ms los size: 9216K in use: 1067K
09-18 19:40:56.708 D/Mono (26714): GC_MAJOR_SWEEP: major size: 11296K in use: 8861K
09-18 19:40:57.775 W/View (26714): requestLayout() improperly called by md51558244f76c53b6aeda52c8a337f2c37.ScrollViewContainer{a304112 V.E...... ......ID 0,0-1080,843} during layout: running second layout pass
09-18 19:40:57.806 W/View (26714): requestLayout() improperly called by md58432a647068b097f9637064b8985a5e0.NavigationPageRenderer{2d32db1 V.E...... ........ 0,0-1080,1947 #8a5} during second layout pass: posting in next frame
09-18 19:40:58.027 W/StaticLayout(26714): maxLineHeight should not be -1. maxLines:1 lineCount:1
09-18 19:40:58.028 I/chatty (26714): uid=10149(prime.craftdev) identical 1 line
09-18 19:40:58.047 W/StaticLayout(26714): maxLineHeight should not be -1. maxLines:1 lineCount:1
09-18 19:40:58.547 W/StaticLayout(26714): maxLineHeight should not be -1. maxLines:1 lineCount:1
09-18 19:40:58.548 W/StaticLayout(26714): maxLineHeight should not be -1. maxLines:1 lineCount:1
09-18 19:40:58.552 W/View (26714): requestLayout() improperly called by md51558244f76c53b6aeda52c8a337f2c37.ScrollViewContainer{d14fc12 V.E...... ......ID 0,0-1080,843} during layout: running second layout pass
09-18 19:40:58.569 W/StaticLayout(26714): maxLineHeight should not be -1. maxLines:1 lineCount:1
09-18 19:40:58.579 W/View (26714): requestLayout() improperly called by md58432a647068b097f9637064b8985a5e0.NavigationPageRenderer{2d32db1 V.E...... ........ 0,0-1080,1947 #8a5} during second layout pass: posting in next frame
09-18 19:40:58.884 W/View (26714): requestLayout() improperly called by md51558244f76c53b6aeda52c8a337f2c37.ScrollViewContainer{850d109 V.E...... ......ID 0,0-1080,843} during layout: running second layout pass
09-18 19:40:58.902 W/View (26714): requestLayout() improperly called by md58432a647068b097f9637064b8985a5e0.NavigationPageRenderer{2d32db1 V.E...... ........ 0,0-1080,1947 #8a5} during second layout pass: posting in next frame
09-18 19:40:58.996 W/StaticLayout(26714): maxLineHeight should not be -1. maxLines:1 lineCount:1
09-18 19:40:59.008 W/StaticLayout(26714): maxLineHeight should not be -1. maxLines:1 lineCount:1
09-18 19:40:59.076 I/prime.craftdev(26714): Explicit concurrent copying GC freed 15234(860KB) AllocSpace objects, 1(20KB) LOS objects, 49% free, 3MB/7MB, paused 74us total 26.104ms
09-18 19:40:59.077 D/Mono (26714): GC_TAR_BRIDGE bridges 303 objects 306 opaque 1 colors 303 colors-bridged 303 colors-visible 303 xref 0 cache-hit 0 cache-semihit 0 cache-miss 0 setup 0.07ms tarjan 0.09ms scc-setup 0.06ms gather-xref 0.01ms xref-setup 0.03ms cleanup 0.08ms
09-18 19:40:59.077 D/Mono (26714): GC_BRIDGE: Complete, was running for 28.38ms
09-18 19:40:59.077 D/Mono (26714): GC_MINOR: (Nursery full) time 9.76ms, stw 11.78ms promoted 972K major size: 11648K in use: 9910K los size: 9216K in use: 2462K
09-18 19:40:59.911 W/View (26714): requestLayout() improperly called by md51558244f76c53b6aeda52c8a337f2c37.ScrollViewContainer{1a24c7c V.E...... ......ID 0,0-1080,843} during layout: running second layout pass
09-18 19:40:59.934 W/View (26714): requestLayout() improperly called by md58432a647068b097f9637064b8985a5e0.NavigationPageRenderer{2d32db1 V.E...... ......ID 0,0-1080,1947 #8a5} during second layout pass: posting in next frame
09-18 19:41:00.065 W/StaticLayout(26714): maxLineHeight should not be -1. maxLines:1 lineCount:1
09-18 19:41:00.066 I/chatty (26714): uid=10149(prime.craftdev) identical 1 line
09-18 19:41:00.087 W/StaticLayout(26714): maxLineHeight should not be -1. maxLines:1 lineCount:1
09-18 19:41:00.412 W/StaticLayout(26714): maxLineHeight should not be -1. maxLines:1 lineCount:1
09-18 19:41:00.412 W/StaticLayout(26714): maxLineHeight should not be -1. maxLines:1 lineCount:1
09-18 19:41:00.416 W/View (26714): requestLayout() improperly called by md51558244f76c53b6aeda52c8a337f2c37.ScrollViewContainer{d508190 V.E...... ......ID 0,0-1080,843} during layout: running second layout pass
09-18 19:41:00.430 W/StaticLayout(26714): maxLineHeight should not be -1. maxLines:1 lineCount:1
09-18 19:41:00.443 W/View (26714): requestLayout() improperly called by md58432a647068b097f9637064b8985a5e0.NavigationPageRenderer{2d32db1 V.E...... ........ 0,0-1080,1947 #8a5} during second layout pass: posting in next frame
09-18 19:41:00.765 I/prime.craftdev(26714): Explicit concurrent copying GC freed 14655(759KB) AllocSpace objects, 0(0B) LOS objects, 49% free, 3MB/7MB, paused 62us total 26.304ms
09-18 19:41:00.768 D/Mono (26714): GC_TAR_BRIDGE bridges 258 objects 50241 opaque 20560 colors 258 colors-bridged 258 colors-visible 258 xref 0 cache-hit 0 cache-semihit 0 cache-miss 0 setup 0.11ms tarjan 22.25ms scc-setup 0.06ms gather-xref 0.01ms xref-setup 0.05ms cleanup 2.12ms
09-18 19:41:00.768 D/Mono (26714): GC_BRIDGE: Complete, was running for 30.43ms
09-18 19:41:00.769 D/Mono (26714): GC_MINOR: (Nursery full) time 34.54ms, stw 36.43ms promoted 1353K major size: 12976K in use: 11376K los size: 9216K in use: 2462K
09-18 19:41:00.844 W/StaticLayout(26714): maxLineHeight should not be -1. maxLines:1 lineCount:1
09-18 19:41:00.845 W/StaticLayout(26714): maxLineHeight should not be -1. maxLines:1 lineCount:1
09-18 19:41:00.849 W/View (26714): requestLayout() improperly called by md51558244f76c53b6aeda52c8a337f2c37.ScrollViewContainer{f2421b5 V.E...... ......ID 0,0-1080,843} during layout: running second layout pass
09-18 19:41:00.919 W/StaticLayout(26714): maxLineHeight should not be -1. maxLines:1 lineCount:1
09-18 19:41:00.953 W/View (26714): requestLayout() improperly called by md58432a647068b097f9637064b8985a5e0.NavigationPageRenderer{2d32db1 V.E...... .......D 0,0-1080,1947 #8a5} during second layout pass: posting in next frame
09-18 19:41:01.791 W/StaticLayout(26714): maxLineHeight should not be -1. maxLines:1 lineCount:1
09-18 19:41:01.792 W/StaticLayout(26714): maxLineHeight should not be -1. maxLines:1 lineCount:1
09-18 19:41:01.795 W/View (26714): requestLayout() improperly called by md51558244f76c53b6aeda52c8a337f2c37.ScrollViewContainer{44ac9bb V.E...... ......ID 0,0-1080,843} during layout: running second layout pass
09-18 19:41:01.812 W/StaticLayout(26714): maxLineHeight should not be -1. maxLines:1 lineCount:1
09-18 19:41:01.822 W/View (26714): requestLayout() improperly called by md58432a647068b097f9637064b8985a5e0.NavigationPageRenderer{2d32db1 V.E...... ........ 0,0-1080,1947 #8a5} during second layout pass: posting in next frame
09-18 19:41:02.066 W/View (26714): requestLayout() improperly called by md51558244f76c53b6aeda52c8a337f2c37.ScrollViewContainer{746c4fd V.E...... ......ID 0,0-1080,843} during layout: running second layout pass
09-18 19:41:02.127 W/StaticLayout(26714): maxLineHeight should not be -1. maxLines:1 lineCount:1
09-18 19:41:02.128 I/chatty (26714): uid=10149(prime.craftdev) identical 1 line
09-18 19:41:02.138 W/StaticLayout(26714): maxLineHeight should not be -1. maxLines:1 lineCount:1
09-18 19:41:02.145 W/View (26714): requestLayout() improperly called by md58432a647068b097f9637064b8985a5e0.NavigationPageRenderer{2d32db1 V.E...... ........ 0,0-1080,1947 #8a5} during second layout pass: posting in next frame
09-18 19:41:02.273 I/prime.craftdev(26714): Explicit concurrent copying GC freed 16718(950KB) AllocSpace objects, 0(0B) LOS objects, 50% free, 3MB/7MB, paused 73us total 26.327ms
09-18 19:41:02.277 D/Mono (26714): GC_TAR_BRIDGE bridges 289 objects 48117 opaque 19843 colors 289 colors-bridged 289 colors-visible 289 xref 0 cache-hit 0 cache-semihit 0 cache-miss 0 setup 0.08ms tarjan 19.94ms scc-setup 0.06ms gather-xref 0.01ms xref-setup 0.03ms cleanup 2.83ms
09-18 19:41:02.277 D/Mono (26714): GC_BRIDGE: Complete, was running for 31.28ms
09-18 19:41:02.277 D/Mono (26714): GC_MINOR: (Nursery full) time 31.45ms, stw 33.34ms promoted 1223K major size: 14208K in use: 12696K los size: 9216K in use: 2462K
09-18 19:41:02.414 W/StaticLayout(26714): maxLineHeight should not be -1. maxLines:1 lineCount:1
09-18 19:41:02.417 W/View (26714): requestLayout() improperly called by md51558244f76c53b6aeda52c8a337f2c37.ScrollViewContainer{9524cdd V.E...... ......ID 0,0-1080,843} during layout: running second layout pass
09-18 19:41:02.433 W/StaticLayout(26714): maxLineHeight should not be -1. maxLines:1 lineCount:1
09-18 19:41:02.449 W/View (26714): requestLayout() improperly called by md58432a647068b097f9637064b8985a5e0.NavigationPageRenderer{2d32db1 V.E...... ........ 0,0-1080,1947 #8a5} during second layout pass: posting in next frame
09-18 19:41:03.477 W/View (26714): requestLayout() improperly called by md51558244f76c53b6aeda52c8a337f2c37.ScrollViewContainer{6095030 V.E...... ......ID 0,0-1080,843} during layout: running second layout pass
09-18 19:41:03.500 W/View (26714): requestLayout() improperly called by md58432a647068b097f9637064b8985a5e0.NavigationPageRenderer{2d32db1 V.E...... ........ 0,0-1080,1947 #8a5} during second layout pass: posting in next frame
09-18 19:41:03.694 W/StaticLayout(26714): maxLineHeight should not be -1. maxLines:1 lineCount:1
09-18 19:41:03.695 W/StaticLayout(26714): maxLineHeight should not be -1. maxLines:1 lineCount:1
09-18 19:41:03.902 W/StaticLayout(26714): maxLineHeight should not be -1. maxLines:1 lineCount:1
09-18 19:41:03.902 W/StaticLayout(26714): maxLineHeight should not be -1. maxLines:1 lineCount:1
09-18 19:41:03.906 W/View (26714): requestLayout() improperly called by md51558244f76c53b6aeda52c8a337f2c37.ScrollViewContainer{3503fe6 V.E...... ......ID 0,0-1080,843} during layout: running second layout pass
09-18 19:41:03.919 W/StaticLayout(26714): maxLineHeight should not be -1. maxLines:1 lineCount:1
09-18 19:41:03.964 I/prime.craftdev(26714): Explicit concurrent copying GC freed 17480(925KB) AllocSpace objects, 0(0B) LOS objects, 50% free, 3MB/7MB, paused 74us total 26.756ms
09-18 19:41:03.965 D/Mono (26714): GC_TAR_BRIDGE bridges 302 objects 395 opaque 54 colors 302 colors-bridged 302 colors-visible 302 xref 0 cache-hit 0 cache-semihit 0 cache-miss 0 setup 0.07ms tarjan 0.16ms scc-setup 0.05ms gather-xref 0.01ms xref-setup 0.02ms cleanup 0.10ms
09-18 19:41:03.965 D/Mono (26714): GC_BRIDGE: Complete, was running for 28.97ms
09-18 19:41:03.965 D/Mono (26714): GC_MINOR: (Nursery full) time 8.11ms, stw 10.51ms promoted 1007K major size: 15248K in use: 13782K los size: 9216K in use: 2462K
Unhandled Exception:

System.NotSupportedException: Unable to activate instance of type Xamarin.Forms.Platform.Android.FastRenderers.LabelRenderer from native handle 0x7fca8de8f4 (key_handle 0xb386ba9).

[johnshardman]

Also getting this (for ImageButtonRenderer) after upgrading to XF 4.5.0.356 . Didn't happen before upgrading (for completeness, I also updated a few other NuGets at the same time, but none that interact with ImageButtons).

System.NotSupportedException
Message=Unable to activate instance of type Xamarin.Forms.Platform.Android.ImageButtonRenderer from native handle 0x7fcb2a3564 (key_handle 0x4dc4486).