Kotlinx.coroutines: IllegalStateException: Module with the Main dispatcher is missing

[trashkalmar]

Our user with Xiaomi Redmi Note 4 device (Android 7.1.2) suddenly started to experience crash that had to be fixed with #657.
We're unable to reproduce it on our side. Here is reproducer app with the same lib dependencies as our main application: https://www.dropbox.com/s/eay696h9qmxjl5e/sample.zip?dl=1

AndroidX AppCompat: 1.0.0
Kotlin: 1.3.0
Coroutines: 1.0.0
Gradle wrapper: 4.10.2-bin

Caused by java.lang.IllegalStateException: Module with the Main dispatcher is missing. Add dependency providing the Main dispatcher, e.g. 'kotlinx-coroutines-android'
       at kotlinx.coroutines.MissingMainCoroutineDispatcher.missing(Dispatchers.kt:123)
       at kotlinx.coroutines.MissingMainCoroutineDispatcher.dispatch(Dispatchers.kt:116)
       at kotlinx.coroutines.DispatchedKt.resumeCancellable(Dispatched.kt:279)
       at kotlinx.coroutines.intrinsics.CancellableKt.startCoroutineCancellable(Cancellable.kt:23)
       at kotlinx.coroutines.CoroutineStart.invoke(CoroutineStart.kt:109)
       at kotlinx.coroutines.AbstractCoroutine.start(AbstractCoroutine.kt:160)
       at kotlinx.coroutines.BuildersKt__Builders_commonKt.launch(Builders.common.kt:54)
       at kotlinx.coroutines.BuildersKt.launch(Unknown Source:1)
       at kotlinx.coroutines.BuildersKt__Builders_commonKt.launch$default(Builders.common.kt:47)
       at kotlinx.coroutines.BuildersKt.launch$default(Unknown Source:1)
       at our.app.ui.base.BaseActivity.startAsync(BaseActivity.kt:229)
       at our.app.ui.main.MainActivity.refreshServerConfig(MainActivity.kt:63)
       at our.app.ui.main.MainActivity.onCreate(MainActivity.kt:134)
       at android.app.Activity.performCreate(Activity.java:6738)
       at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119)
       at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2652)
       at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2766)
       at android.app.ActivityThread.-wrap12(ActivityThread.java)
       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1507)
       at android.os.Handler.dispatchMessage(Handler.java:102)
       at android.os.Looper.loop(Looper.java:154)
       at android.app.ActivityThread.main(ActivityThread.java:6236)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:891)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:781)

[trashkalmar]

UPD: We also use jetifier processor:

classpath "com.android.tools.build.jetifier:jetifier-processor:1.0.0-alpha10"

Newer version (1.0.0-beta02) is not compatible with databinding.

[Arayldan]

Uncomment the last two lines in your sample's proguard-rules.pro

[kimcy929]

I enabled R8 and it is the problem. Only proguard no problem. coroutines version 1.0.1

[evgentset]

I has same issue and fixed it by adding options from coroutines.pro to proguard. Hope it helps somebody.

[marlboro3420]

@evgentset thanks, worked for me. coroutines version 1.0.1

[Serisium]

Seconding @evgentset's fix! Worked for me on coroutines 1.1.1

[dendrocyte]

I have the same issue. but the link is not available now. Could @evgentset provide again? please

[marlboro3420]

coroutines.pro @dendrocyte a copy from @evgentset

[kimcy929]

@dendrocyte if you are having options for Kotlin in build.gradle packageOptions you can remove them. It will work again without need adding the proguard rule. In my case, I could export file APK but it had the RunTimeException when opening the app so I removed all packageOptions for kotlin and it worked fine with Kotlin 1.3.31 and coroutine 1.2.1

[endru-kargo]

In our case, we put signingConfigs in the gradle file, then use the Generate Signed Bundle / APK to create the bundle. :D
Removing the signingConfigs solves the problem.

[dendrocyte]

@endru-kargo I will try your solution later. thank you!!!

[elizarov]

Did it help?

[dendrocyte]

my client phone are Samsung and Sharp which are hit this error.
At the end, I upgrade your lib to 1.2.1, and make the error
from
Job = launch{}
change to
Job = launch{} as CompletableJob.
Then it fix!

[RahulSDeshpande]

I has same issue and fixed it by adding options from coroutines.pro to proguard. Hope it helps somebody.

Correcting the git link 'coroutines.pro'.

[igorwojda]

For me updating Koltin to 1.3.50 and coroutines to 1.3.2 (having AGP 3.5.1) fixed the issue (I guess that it was initially broken by APG update or Dexguard update)

[jmamath]

It was also discussed in issue #1532. Turning kotlin [1.3.50 -> 1.3.61], coroutines [1.3.1 -> 1.3.3] did the work for me.