Xamarin-macios: MSB4226: The imported project "/Library/Frameworks/Mono.framework/Versions/6.12.0/lib/mono/xbuild/Xamarin/Mac/Xamarin.Mac.CSharp.targets" was not found.

Created on 31 Aug 2020  路  19Comments  路  Source: xamarin/xamarin-macios

Steps to Reproduce

  1. Install stable XM
  2. Build a new/existing project

Expected Behavior

Success

Actual Behavior

/Users/poupou/git/xamarin/SubmissionSamples/MacCoolApp_DontLink/MacCoolApp/MacCoolApp.csproj(89,11): error MSB4226: The imported project "/Library/Frameworks/Mono.framework/Versions/6.12.0/lib/mono/xbuild/Xamarin/Mac/Xamarin.Mac.CSharp.targets" was not found. Also, tried to find "Xamarin/Mac/Xamarin.Mac.CSharp.targets" in the fallback search path(s) for $(MSBuildExtensionsPath) - "/Library/Frameworks/Mono.framework/External/xbuild/" . These search paths are defined in "/Library/Frameworks/Mono.framework/Versions/6.12.0/lib/mono/msbuild/Current/bin/MSBuild.dll.config". Confirm that the path in the <Import> declaration is correct, and that the file exists on disk in one of the search paths.

This does not seems to happen on d16-8 (or newer) and does not always happen.
I _wonder_ if this only happens when downgrading ?!?

Environment

=== Visual Studio Enterprise 2019 for Mac ===

Version 8.7.4 (build 38)
Installation UUID: a8ba93d0-79b6-41af-a590-4edb9c2095b4
    GTK+ 2.24.23 (Raleigh theme)
    Xamarin.Mac 6.18.0.23 (d16-6 / 088c73638)

    Package version: 612000090

=== Mono Framework MDK ===

Runtime:
    Mono 6.12.0.90 (2020-02/d3daacdaa80) (64-bit)
    Package version: 612000090

=== Xamarin Designer ===

Version: 16.7.0.492
Hash: f5afe667d
Branch: remotes/origin/d16-7-vsmac
Build date: 2020-07-10 18:42:54 UTC

=== Roslyn (Language Service) ===

3.7.0-6.20412.3+d3c3a44a4e7ad31cc75c59be0d3df4a19ff33878

=== NuGet ===

Version: 5.7.0.6702

=== .NET Core SDK ===

SDK: /usr/local/share/dotnet/sdk/5.0.100-rc.1.20426.3/Sdks
SDK Versions:
    5.0.100-rc.1.20426.3
    5.0.100-rc.1.20414.5
    5.0.100-preview.8.20359.11
    5.0.100-preview.7.20317.11
    5.0.100-preview.6.20265.2
    5.0.100-preview.5.20263.11
    5.0.100-preview.5.20256.10
    5.0.100-preview.5.20227.4
    5.0.100-preview.4.20214.36
    5.0.100-preview.1.20155.7
    3.1.200
    3.1.100
    2.1.806
MSBuild SDKs: /Library/Frameworks/Mono.framework/Versions/6.12.0/lib/mono/msbuild/Current/bin/Sdks

=== .NET Core Runtime ===

Runtime: /usr/local/share/dotnet/dotnet
Runtime Versions:
    5.0.0-rc.1.20425.16
    5.0.0-rc.1.20404.16
    5.0.0-rc.1.20371.13
    5.0.0-preview.8.20358.9
    5.0.0-preview.7.20317.2
    5.0.0-preview.6.20264.1
    3.1.2
    3.1.0
    2.1.21
    2.1.20
    2.1.18

=== Xamarin.Profiler ===

Version: 1.6.15.68
Location: /Applications/Xamarin Profiler.app/Contents/MacOS/Xamarin Profiler

=== Updater ===

Version: 11

=== Xamarin.Android ===

Version: 11.0.2.0 (Visual Studio Enterprise)
Commit: xamarin-android/d16-7/025fde9
Android SDK: /Users/poupou/Library/Developer/Xamarin/android-sdk-macosx
    Supported Android versions:
        4.4 (API level 19)
        7.1 (API level 25)
        8.1 (API level 27)

SDK Tools Version: 26.1.1
SDK Platform Tools Version: 29.0.5
SDK Build Tools Version: 29.0.2

Build Information: 
Mono: 83105ba
Java.Interop: xamarin/java.interop/d16-7@1f3388a
ProGuard: Guardsquare/proguard/proguard6.2.2@ebe9000
SQLite: xamarin/sqlite/3.32.1@1a3276b
Xamarin.Android Tools: xamarin/xamarin-android-tools/d16-7@017078f

=== Microsoft OpenJDK for Mobile ===

Java SDK: /Users/poupou/Library/Developer/Xamarin/jdk/microsoft_dist_openjdk_1.8.0.25
1.8.0-25
Android Designer EPL code available here:
https://github.com/xamarin/AndroidDesigner.EPL

=== Android SDK Manager ===

Version: 16.7.0.13
Hash: 8380518
Branch: remotes/origin/d16-7~2
Build date: 2020-08-19 22:18:28 UTC

=== Android Device Manager ===

Version: 16.7.0.24
Hash: bb090a3
Branch: remotes/origin/d16-7
Build date: 2020-08-19 22:18:52 UTC

=== Apple Developer Tools ===

Xcode 11.6 (16141)
Build 11E708

=== Xamarin.Mac ===

Version: 6.20.2.3 (Visual Studio Enterprise)
Hash: 64004ee25
Branch: d16-7
Build date: 2020-07-22 12:52:13-0400

=== Xamarin.iOS ===

Version: 13.20.2.3 (Visual Studio Enterprise)
Hash: 64004ee25
Branch: d16-7
Build date: 2020-07-22 12:52:13-0400

=== Build Information ===

Release ID: 807040038
Git revision: 7f322926a2e0a5fa0c1e3833215a191883f7514a
Build date: 2020-08-20 10:10:20-04
Build branch: release-8.7
Xamarin extensions: 7f322926a2e0a5fa0c1e3833215a191883f7514a

=== Operating System ===

Mac OS X 10.15.6
Darwin 19.6.0 Darwin Kernel Version 19.6.0
    Thu Jun 18 20:49:00 PDT 2020
    root:xnu-6153.141.1~1/RELEASE_X86_64 x86_64

Build Logs

https://gist.github.com/spouliot/e8092ad8c26b9f322b3a97e68b736a34

Example Project (If Possible)

XM submissions tests can be used.

bug macOS
Source
picture spouliot
👍1

Most helpful comment

@tekmun Did you try this workaround?

The workaround is to manually remove /Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Mac:

sudo rm -Rf /Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Mac

and then reinstall the Xamarin.Mac pkg you want to install (there's no need to remove/reinstall Mono).

picture rolfbjarne on 30 Sep 2020
👍3

All 19 comments

There is no Xamarin directory under the /Library/Frameworks/Mono.framework/Versions/6.12.0/lib/mono/xbuild/ directory

But it does not exists on the preview (or xcode12) channel either

spouliot picture spouliot on 31 Aug 2020

The Xamarin is in /Library/Frameworks/Mono.framework/External/xbuild/. The /Library/Frameworks/Mono.framework/Versions/6.12.0/lib/mono/xbuild/ directory that shows up in the error could be a backup directory that's checked when the External one fails.

Could this be related to installing mono after Xamarin.Mac?

rolfbjarne picture rolfbjarne on 31 Aug 2020

The Xamarin is in /Library/Frameworks/Mono.framework/External/xbuild/.

I'll double check it but it _should_ be fine since XI has no issue...

Could this be related to installing mono after Xamarin.Mac?

No, that was my first thought too (and what I suggested to someone else who hit the issue before).

I re-installed XM (and XI) over the mono update and still got the same issue. I'll try nuking both to see if left-overs from upgrades/downgrades could explain it.

spouliot picture spouliot on 31 Aug 2020

workaround: Nuking mono and XM and then re-installing both works.

rm -rf /Library/Frameworks/Mono.framework/
rm -rf /Library/Frameworks/Xamarin.Mac.framework/

So there's something after upgrades/downgrades that can break stable XM.

spouliot picture spouliot on 31 Aug 2020

We have experienced but not everyone has been effected. We're all on latest XCode 11.6 and latest VSMac (within last week). Only 2 of the 4 of us get this issue.

It also effected our cloud builds provided by Bitrise (who may have been in touch directly regarding this issue)

projectgoav picture projectgoav on 3 Sep 2020

I got this again after installed Xcode 12 preview (d16-7 based) on top of d16-8.
This does seems related to downgrading XM.

spouliot picture spouliot on 3 Sep 2020
👍1

In this state

  • re-installing the current Xamarin.Mac does not help;
  • re-installing the current Mono does not help;
  • re-installing the current Mono and current Xamarin.Mac does not help;

but

  • nuking Mono and Xamarin.Mac then re-installing the current version works
spouliot picture spouliot on 3 Sep 2020
👍1

Thanks @spouliot!

Here's the steps I followed to fix it for me on macOS:

Uninstall Xamarin

Following the steps from the official Microsoft docs to uninstall Xamarin.iOS, Xamarin.Mac, Xamarin.Android and Visual Studio for Mac

  1. On macOS, save this script to as uninstall-vsmac.sh to ~/Downloads (ie ~/Downloads/uninstall-vsmac.sh
  2. On macOS, open the Terminal
  3. In the Terminal, enter the following commands:
cd ~/Downloads
chmod +x ./uninstall-vsmac.sh
sudo ./uninstall-vsmac.sh
  1. In the Terminal, if requested, enter your macOS password

Download/Install Visual Studio for Mac

  1. In a browser, navigate to https://visualstudio.microsoft.com/thank-you-downloading-visual-studio-mac/?sku=communitymac&rel=16
  2. Launch the Installer and follow the instructions on the installation wizard
brminnick picture brminnick on 10 Sep 2020
👍3

I think this happens because of 24201084d9e3955406d5e7eebdcd6d45af790e58, and problems occur when first installing a Xamarin.Mac version with those changes, then downgrading to one without.

It seems macOS isn't capable of properly installing a package that replaces a symlink with a directory, and instead ends up writing into where the symlink is pointing to. The broken result is that several files that should be files somehow end up as directories (note how all these *.targets and *.props files are in fact directories):

$ ls -la /Library/Frameworks/Xamarin.Mac.framework/Versions/6.20.2.2/lib/msbuild
total 56
drwxr-xr-x  20 rolf  wheel    640 Sep 14 14:36 .
drwxr-xr-x  31 rolf  wheel    992 Sep 14 14:36 ..
-rw-r--r--   1 rolf  wheel  25112 Jul 19 00:45 FrameworkList.xml
drwxr-xr-x   2 rolf  wheel     64 Sep 14 14:36 Xamarin.Localization.MSBuild.dll
drwxr-xr-x   2 rolf  wheel     64 Sep 14 14:36 Xamarin.Mac.AppExtension.CSharp.targets
drwxr-xr-x   2 rolf  wheel     64 Sep 14 14:36 Xamarin.Mac.AppExtension.Common.props
drwxr-xr-x   2 rolf  wheel     64 Sep 14 14:36 Xamarin.Mac.AppExtension.Common.targets
drwxr-xr-x   2 rolf  wheel     64 Sep 14 14:36 Xamarin.Mac.CSharp.targets
drwxr-xr-x   2 rolf  wheel     64 Sep 14 14:36 Xamarin.Mac.Common.ImplicitFacade.msbuild.targets
drwxr-xr-x   2 rolf  wheel     64 Sep 14 14:36 Xamarin.Mac.Common.props
drwxr-xr-x   2 rolf  wheel     64 Sep 14 14:36 Xamarin.Mac.Common.targets
drwxr-xr-x   2 rolf  wheel     64 Sep 14 14:36 Xamarin.Mac.FSharp.targets
drwxr-xr-x   2 rolf  wheel     64 Sep 14 14:36 Xamarin.Mac.ObjCBinding.CSharp.props
drwxr-xr-x   2 rolf  wheel     64 Sep 14 14:36 Xamarin.Mac.ObjCBinding.CSharp.targets
drwxr-xr-x   2 rolf  wheel     64 Sep 14 14:36 Xamarin.Mac.ObjCBinding.Common.props
drwxr-xr-x   2 rolf  wheel     64 Sep 14 14:36 Xamarin.Mac.ObjCBinding.Common.targets
drwxr-xr-x   2 rolf  wheel     64 Sep 14 14:36 Xamarin.Mac.TargetFrameworkFix.targets
drwxr-xr-x   2 rolf  wheel     64 Sep 14 14:36 Xamarin.Mac.Tasks.dll
drwxr-xr-x   2 rolf  wheel     64 Sep 14 14:36 Xamarin.Mac.msbuild.targets
drwxr-xr-x   2 rolf  wheel     64 Sep 14 14:36 Xamarin.Shared.targets

The workaround is to manually remove /Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Mac:

sudo rm -Rf /Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Mac

and then reinstall the Xamarin.Mac pkg you want to install (there's no need to remove/reinstall Mono).

rolfbjarne picture rolfbjarne on 14 Sep 2020

I'm running into this too with the Xcode 12 Preview.

Update: This seems fixed in the Stable channel today.

praeclarum picture praeclarum on 19 Sep 2020

Thanks @spouliot!

Here's the steps I followed to fix it for me on macOS:

Uninstall Xamarin

Following the steps from the official Microsoft docs to uninstall Xamarin.iOS, Xamarin.Mac, Xamarin.Android and Visual Studio for Mac

  1. On macOS, save this script to as uninstall-vsmac.sh to ~/Downloads (ie ~/Downloads/uninstall-vsmac.sh
  2. On macOS, open the Terminal
  3. In the Terminal, enter the following commands:
cd ~/Downloads
chmod +x ./uninstall-vsmac.sh
sudo ./uninstall-vsmac.sh
  1. In the Terminal, if requested, enter your macOS password

Download/Install Visual Studio for Mac

  1. In a browser, navigate to https://visualstudio.microsoft.com/thank-you-downloading-visual-studio-mac/?sku=communitymac&rel=16
  2. Launch the Installer and follow the instructions on the installation wizard

I followed this step but still getting the same error.
The installation did make a symlink /Library/Frameworks/Mono.framework/Versions/6.12.0/lib/mono/xbuild/Xamarin/Mac -> /Library/Frameworks/Xamarin.Mac.framework/Versions/Current/lib/msbuild

The directory Xamarin.Mac.CSharp.targets is empty. Is this correct? Thanks.

tekmun picture tekmun on 30 Sep 2020

@tekmun Did you try this workaround?

The workaround is to manually remove /Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Mac:

sudo rm -Rf /Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Mac

and then reinstall the Xamarin.Mac pkg you want to install (there's no need to remove/reinstall Mono).

rolfbjarne picture rolfbjarne on 30 Sep 2020
👍3

I tried the workaround, but I am still getting the same error.

amirvenus picture amirvenus on 1 Nov 2020

The same issue occurs when building SDK from sources.
I took the build e30c41de32f64eca655953b17c78c1d9d70249e3 (tag xamarin-ios-14.4.1.3)
And after make world there is no Mono.framework folder inside _mac-build. Everything is OK with _ios-build meanwhile.

xtmq picture xtmq on 5 Nov 2020

Any updates on this? Thanks!

xtmq picture xtmq on 22 Nov 2020

@xtmq that particular xamarin-macios hash has the Xamarin.Mac build disabled, because the corresponding Xcode release doesn't ship with an updated macOS SDK.

This has recently changed (with Xcode 12.2), so you can use either the main or the d16-8 branch.

rolfbjarne picture rolfbjarne on 23 Nov 2020

Ran into this too, and @ToddGrun has just run into this as well.

KirillOsenkov picture KirillOsenkov on 8 Dec 2020

I am facing the same issue till I have installed the fresh Visual Studio 2017 and the mac os 10.13.6.

/Users/shubhamagrawal/Projects/mloi/mloi.iOS/mloi.iOS.csproj(3,3): Error MSB4019: The imported project "/Library/Frameworks/Mono.framework/Versions/6.12.0/lib/mono/xbuild/Xamarin/iOS/Xamarin.iOS.CSharp.targets" was not found. Confirm that the expression in the Import declaration "/Library/Frameworks/Mono.framework/Versions/6.12.0/lib/mono/xbuild/Xamarin/iOS/Xamarin.iOS.CSharp.targets" is correct, and that the file exists on disk. (MSB4019)

Please help me to resolve the issue.

shubhuuu picture shubhuuu on 13 Dec 2020

@shubhuuu that's a different issue, so please file a new issue so that this doesn't end up too confusing.

rolfbjarne picture rolfbjarne on 14 Dec 2020
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