Kotlinx.coroutines: Module with the Main dispatcher had failed to initialize

[marenovakovic]

Getting this error on android. coroutiens version 1.0.0
java.lang.IllegalStateException: Module with the Main dispatcher had failed to initialize at kotlinx.coroutines.internal.MissingMainCoroutineDispatcher.missing(MainDispatchers.kt:79) at kotlinx.coroutines.internal.MissingMainCoroutineDispatcher.isDispatchNeeded(MainDispatchers.kt:54) at kotlinx.coroutines.DispatchedKt.resumeCancellable(Dispatched.kt:373) at kotlinx.coroutines.intrinsics.CancellableKt.startCoroutineCancellable(Cancellable.kt:25) at kotlinx.coroutines.CoroutineStart.invoke(CoroutineStart.kt:109) at kotlinx.coroutines.AbstractCoroutine.start(AbstractCoroutine.kt:160) at kotlinx.coroutines.channels.ActorKt.actor(Actor.kt:121) at kotlinx.coroutines.channels.ActorKt.actor$default(Actor.kt:112)

[qwwdfsad]

Please update to 1.1.0 and see if it still reproduces.
Also, it is useful to provide full stacktrace (this exception should have a meaningful cause) and some context.

[webfrea-k]

Had the same issue in 1.0.1, point of crash:
private val uiScope = CoroutineScope(Dispatchers.Main)
uiScope.launch {} -> Crash
The issue is resolved in version 1.1.0

[marenovakovic]

Upgrading to 1.1.0 solved it. Android Studio haven't showed there is newer version, hm. Thanks.

[JabezNzomo99]

Upgrading to 1.1.0 solved it for me as well.
implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.1.0

[Jeff11]

This still happens on kotlinx-coroutines-android:1.1.1
80% Android 6.0.x, 20% Android 5.1
Unfortunately I couldn't reproduce on a Samsung S5 test device.

Fatal Exception: java.lang.IllegalStateException: Module with the Main dispatcher had failed to initialize
       at kotlinx.coroutines.internal.MissingMainCoroutineDispatcher.missing(MainDispatchers.kt:79)
       at kotlinx.coroutines.internal.MissingMainCoroutineDispatcher.isDispatchNeeded(MainDispatchers.kt:54)
       at kotlinx.coroutines.DispatchedKt.resumeCancellable(Dispatched.kt:373)
       at kotlinx.coroutines.intrinsics.CancellableKt.startCoroutineCancellable(Cancellable.kt:25)
       at kotlinx.coroutines.CoroutineStart.invoke(AbstractCoroutine.kt:109)
       at kotlinx.coroutines.BuildersKt__Builders_commonKt.launch(Unknown Source:54)
       at kotlinx.coroutines.BuildersKt__Builders_commonKt.launch$default$28f1ba1(Builders.common.kt:47)
       at kotlinx.coroutines.BuildersKt.launch(Unknown Source:1)
       at my.app.NotesFragment.loadSomething(NotesFragment.kt:542)
       at my.app.NotesFragment.onCreateView(NotesFragment.kt:101)
       at androidx.fragment.app.Fragment.performCreateView(Fragment.java:2530)
...
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)

Caused by java.util.ServiceConfigurationError: Couldn't read jar:file:/data/app/my.app-1/base.apk!/META-INF/services/kotlinx.coroutines.internal.MainDispatcherFactory
       at java.util.ServiceLoader$ServiceIterator.readClass(ServiceLoader.java:245)
       at java.util.ServiceLoader$ServiceIterator.hasNext(ServiceLoader.java:202)
       at kotlin.collections.CollectionsKt___CollectionsKt.toCollection(_Collections.kt:1145)
       at kotlin.collections.CollectionsKt___CollectionsKt.toMutableList(_Collections.kt:1178)
       at kotlin.collections.CollectionsKt___CollectionsKt.toList(_Collections.kt:1169)
       at kotlinx.coroutines.internal.MainDispatcherLoader.loadMainDispatcher(MainDispatchers.kt:15)
       at kotlinx.coroutines.internal.MainDispatcherLoader.(MainDispatchers.kt:10)
       at kotlinx.coroutines.Dispatchers.getMain(Dispatchers.kt:55)
       at my.app.MainCoroutineScope$DefaultImpls.getCoroutineContext(MainCoroutineScope.kt:9)
       at my.app.NotesFragment.getCoroutineContext(NotesFragment.kt:64)
       at kotlinx.coroutines.CoroutineContextKt.newCoroutineContext(CoroutineContext.kt:57)
       at kotlinx.coroutines.BuildersKt__Builders_commonKt.launch(Unknown Source:50)
       at kotlinx.coroutines.BuildersKt__Builders_commonKt.launch$default$28f1ba1(Builders.common.kt:47)
       at kotlinx.coroutines.BuildersKt.launch(Unknown Source:1)
       at my.app.NotesFragment.loadSomething(NotesFragment.kt:542)
       at my.app.NotesFragment.onCreateView(NotesFragment.kt:101)
       at androidx.fragment.app.Fragment.performCreateView(Fragment.java:2530)
...
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)



md5-813f2c58a2081a6e984db35c8d653175



Caused by java.util.ConcurrentModificationException
       at java.util.HashMap$HashIterator.nextEntry(HashMap.java:788)
...
       at java.util.ServiceLoader$ServiceIterator.hasNext(ServiceLoader.java:202)
       at kotlin.collections.CollectionsKt___CollectionsKt.toCollection(_Collections.kt:1145)
       at kotlin.collections.CollectionsKt___CollectionsKt.toMutableList(_Collections.kt:1178)
       at kotlin.collections.CollectionsKt___CollectionsKt.toList(_Collections.kt:1169)
       at kotlinx.coroutines.internal.MainDispatcherLoader.loadMainDispatcher(MainDispatchers.kt:15)
       at kotlinx.coroutines.internal.MainDispatcherLoader.(MainDispatchers.kt:10)
       at kotlinx.coroutines.Dispatchers.getMain(Dispatchers.kt:55)
       at my.app.MainCoroutineScope$DefaultImpls.getCoroutineContext(MainCoroutineScope.kt:9)
       at my.app.NotesFragment.getCoroutineContext(NotesFragment.kt:64)
       at kotlinx.coroutines.CoroutineContextKt.newCoroutineContext(CoroutineContext.kt:57)
       at kotlinx.coroutines.BuildersKt__Builders_commonKt.launch(Unknown Source:50)
       at kotlinx.coroutines.BuildersKt__Builders_commonKt.launch$default$28f1ba1(Builders.common.kt:47)
       at kotlinx.coroutines.BuildersKt.launch(Unknown Source:1)
       at my.app.NotesFragment.loadSomething(NotesFragment.kt:542)
       at my.app.NotesFragment.onCreateView(NotesFragment.kt:101)
       at androidx.fragment.app.Fragment.performCreateView(Fragment.java:2530)
...
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)

[oarostovtseva]

Agree, still reproducible with kotlinx-coroutines-android:1.1.1

[mochadwi]

@oarostovtseva @Jeff11 try this: https://github.com/Kotlin/kotlinx.coroutines/blob/39c7ca5eb931d25fa06fea2171b1be17a5490a15/core/kotlinx-coroutines-core/resources/META-INF/proguard/coroutines.pro

[dendrocyte]

The same here. kotlinx-coroutines-android:1.1.1 still have this issue

[dendrocyte]

@mochadwi In my case, I have to use this
-keepnames class kotlinx.coroutines.internal.MainDispatcherFactory { ; }
-keep class kotlinx.coroutines.android.AndroidExceptionPreHandler { *; }
-keep class kotlinx.coroutines.android.AndroidDispatcherFactory { *; }
-keepnames class kotlinx.coroutines.CoroutineExceptionHandler {;}
-keepclassmembernames class kotlinx.** {
volatile ;
}

AndroidExceptionPreHandler and AndroidDispatcherFactory have to use "keep" not "keepnames"
otherwise it will cause another exception about lack of this dependency.

in kotlinx-coroutines-android:1.1.1:
it still has issue, if I would like to resign the apk in google play store.

[ezamelczyk]

@qwwdfsad please reopen this issue as it still persists.

[qwwdfsad]

I am reopening the issue to make it easier to find.
But there is not much we can do from our side, this is an Android toolchain issue and it should be reported to Google bug tracker

[firelonely]

Please add
implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:version"
the version as same as
implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:version"
I do this, solved it.
it maybe help you.

[liangsaifei]

Please add
implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:version"
the version as same as
implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:version"
I do this, solved it.
it maybe help you.

thanks a lot

[techartist]

Please add
implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:version"
the version as same as
implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:version"

and both versions are 1.1.1

Solved it for me.

[MrJorgeXavier]

Even with both coroutines-core and coroutines-android modules being in the same version, the problem persist for me.

[giovankabisano]

Very lack of context here...
If you got this error in the implementation code file, you just simply update the coroutines version and it works.
If you got this error in the test file (error should be like this A test rule to allow testing coroutines that use the main dispatcher. Without this you'd run into "java.lang.IllegalStateException: Module with the Main dispatcher had failed to initialize. For tests Dispatchers.setMain from kotlinx-coroutines-test module can be used" ). You can simply add coroutines rule. You can see the code in here https://gist.github.com/AniketSK/0fd48da9ed969eee307f92457115612a

[dwitio]

Please add
implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:version"
the version as same as
implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:version"
I do this, solved it.
it maybe help you.

solved for me, thanks

[vsay01]

@giovankabisano I have the same issue in test. The problem is that the test pass locally but failed in Jenkin with:

Exception in thread "default" java.lang.IllegalStateException: Module with the Main dispatcher had failed to initialize. For tests Dispatchers.setMain from kotlinx-coroutines-test module can be used
    at kotlinx.coroutines.internal.MissingMainCoroutineDispatcher.missing(MainDispatchers.kt:96)
    at kotlinx.coroutines.internal.MissingMainCoroutineDispatcher.isDispatchNeeded(MainDispatchers.kt:71)
    at kotlinx.coroutines.test.internal.TestMainDispatcher.isDispatchNeeded(MainTestDispatcher.kt:39)
    at kotlinx.coroutines.DispatchedKt.resumeCancellable(Dispatched.kt:420)
    at kotlinx.coroutines.intrinsics.CancellableKt.startCoroutineCancellable(Cancellable.kt:26)
    at kotlinx.coroutines.CoroutineStart.invoke(CoroutineStart.kt:109)
    at kotlinx.coroutines.AbstractCoroutine.start(AbstractCoroutine.kt:154)
    at kotlinx.coroutines.BuildersKt__Builders_commonKt.launch(Builders.common.kt:54)
    at kotlinx.coroutines.BuildersKt.launch(Unknown Source)
    at kotlinx.coroutines.BuildersKt__Builders_commonKt.launch$default(Builders.common.kt:47)
    at kotlinx.coroutines.BuildersKt.launch$default(Unknown Source)

Any suggestions ?

[parahall]

Hey folks
Posting ti here since it happens to us as well:
Hey Folks
I'm with AGP 3.6.1 with coroutines 1.3.3 and following R8 rules:

ServiceLoader support

-keepnames class kotlinx.coroutines.internal.MainDispatcherFactory {}
-keepnames class kotlinx.coroutines.CoroutineExceptionHandler {}
-keepnames class kotlinx.coroutines.android.AndroidExceptionPreHandler {}
-keepnames class kotlinx.coroutines.android.AndroidDispatcherFactory {}

Most of volatile fields are updated with AFU and should not be mangled

-keepclassmembernames class kotlinx.** {
volatile ;
}

Same story for the standard library's SafeContinuation that also uses AtomicReferenceFieldUpdater

-keepclassmembernames class kotlin.coroutines.SafeContinuation {
volatile ;
}

and we faced this exception that is similar to what we have here in bug
Fatal Exception: java.lang.IllegalStateException: Module with the Main dispatcher had failed to initialize
at kotlinx.coroutines.internal.MissingMainCoroutineDispatcher.missing(MissingMainCoroutineDispatcher.java:95)
at kotlinx.coroutines.internal.MissingMainCoroutineDispatcher.isDispatchNeeded(MissingMainCoroutineDispatcher.java:69)
at kotlinx.coroutines.DispatchedContinuationKt.resumeCancellableWith(DispatchedContinuationKt.java:268)
at kotlinx.coroutines.intrinsics.CancellableKt.startCoroutineCancellable(CancellableKt.java:26)
at kotlinx.coroutines.CoroutineStart.invoke(CoroutineStart.java:109)
at kotlinx.coroutines.AbstractCoroutine.start(AbstractCoroutine.java:158)
at kotlinx.coroutines.BuildersKt__Builders_commonKt.launch(BuildersKt__Builders_commonKt.java:54)
at kotlinx.coroutines.BuildersKt.launch(BuildersKt.java:1)
at kotlinx.coroutines.BuildersKt__Builders_commonKt.launch$default(BuildersKt__Builders_commonKt.java:47)
at kotlinx.coroutines.BuildersKt.launch$default(BuildersKt.java:1)
at com.monday.core.BaseTaskRunner.run(BaseTaskRunner.java:100)
at com.dapulse.dapulse.refactor.feature.notifications.ui.NotificationListAdapter.handleNewDataPayload(NotificationListAdapter.java:91)
at com.dapulse.dapulse.refactor.feature.notifications.ui.NotificationListAdapter.lambda$setupMailBox$0(NotificationListAdapter.java:84)
at com.dapulse.dapulse.refactor.feature.notifications.ui.-$$Lambda$NotificationListAdapter$WAZEsTQp9Niqg-cXEd4I8dfwAjA.invoke(-.java:4)
at com.dapulse.dapulse.refactor.layers.data.board.mailBox.MailBox$startReceiveMail$1.invokeSuspend(MailBox.java:13)
at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(BaseContinuationImpl.java:33)
at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.java:56)
at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.java:561)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.java:727)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.java:667)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.java:655)
Caused by java.lang.ClassCastException: kotlinx.coroutines.android.AndroidExceptionPreHandler cannot be cast to kotlinx.coroutines.internal.MainDispatcherFactory
at kotlinx.coroutines.internal.MainDispatcherLoader.loadMainDispatcher(MainDispatcherLoader.java:127)
at kotlinx.coroutines.internal.MainDispatcherLoader.(MainDispatcherLoader.java:18)
at kotlinx.coroutines.Dispatchers.getMain(Dispatchers.java:58)
at com.monday.core.MainThreadTaskRunner.(MainThreadTaskRunner.java:131)
at com.dapulse.dapulse.refactor.feature.notifications.mvpvm.view.viewPager.NotificationsViewPagerAdapter.(NotificationsViewPagerAdapter.java:32)
at com.dapulse.dapulse.refactor.feature.notifications.mvpvm.view.NotificationsFragment.initViewPager(NotificationsFragment.java:204)
at com.dapulse.dapulse.refactor.feature.notifications.mvpvm.view.NotificationsFragment.access$initViewPager(NotificationsFragment.java:41)
at com.dapulse.dapulse.refactor.feature.notifications.mvpvm.view.NotificationsFragment$setupPresenterObservationsOnCreateView$1.invoke(NotificationsFragment.java:102)
at com.dapulse.dapulse.refactor.feature.notifications.mvpvm.view.NotificationsFragment$setupPresenterObservationsOnCreateView$1.invoke(NotificationsFragment.java:41)
at com.dapulse.dapulse.refactor.feature.notifications.mvpvm.viewModel.NotificationsViewModel$observeTabsData$2.onChanged(NotificationsViewModel.java:70)
at com.dapulse.dapulse.refactor.feature.notifications.mvpvm.viewModel.NotificationsViewModel$observeTabsData$2.onChanged(NotificationsViewModel.java:14)
at androidx.lifecycle.LiveData.considerNotify(LiveData.java:131)
at androidx.lifecycle.LiveData.dispatchingValue(LiveData.java:144)
at androidx.lifecycle.LiveData$ObserverWrapper.activeStateChanged(LiveData.java:442)
at androidx.lifecycle.LiveData$LifecycleBoundObserver.onStateChanged(LiveData.java:394)
at androidx.lifecycle.LifecycleRegistry$ObserverWithState.dispatchEvent(LifecycleRegistry.java:361)
at androidx.lifecycle.LifecycleRegistry.forwardPass(LifecycleRegistry.java:300)
at androidx.lifecycle.LifecycleRegistry.sync(LifecycleRegistry.java:339)
at androidx.lifecycle.LifecycleRegistry.moveToState(LifecycleRegistry.java:145)
at androidx.lifecycle.LifecycleRegistry.handleLifecycleEvent(LifecycleRegistry.java:131)
at androidx.fragment.app.Fragment.performStart(Fragment.java:2637)
at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:915)
at androidx.fragment.app.FragmentManagerImpl.addAddedFragments(FragmentManagerImpl.java:2100)
at androidx.fragment.app.FragmentManagerImpl.executeOpsTogether(FragmentManagerImpl.java:1874)
at androidx.fragment.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManagerImpl.java:1830)
at androidx.fragment.app.FragmentManagerImpl.execPendingActions(FragmentManagerImpl.java:1727)
at androidx.fragment.app.FragmentManagerImpl$2.run(FragmentManagerImpl.java:150)
at android.os.Handler.handleCallback(Handler.java:790)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6527)
at java.lang.reflect.Method.invoke(Method.java)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)

cleaning the cache and rebuild solve the issue for now but it's returning time to time in our instrumentation tests on release builds:
java.lang.IllegalStateException: Module with the Main dispatcher had failed to initialize
FATAL EXCEPTION: DefaultDispatcher-worker-1
Process: com.monday.monday, PID: 10833
java.lang.IllegalStateException: Module with the Main dispatcher had failed to initialize
at rs5.n(MainDispatchers.kt:3)
at rs5.b(MainDispatchers.kt:1)
at ap5.a(DispatchedContinuation.kt:3)
at xs5.a(Unknown Source:8)
at sn5.a(AbstractCoroutine.kt:14)
at kotlinx.coroutines.BuildersKt.launch$default(Unknown Source:7)
at t45.run(TaskRunner.kt:1)
at d$l.invoke(NativeSignupPresenter.kt:5)
at d$d.invokeSuspend(NativeSignupPresenter.kt:17)
at d$d.invoke(NativeSignupPresenter.kt:2)
at v45$a.invokeSuspend(TaskRunner.kt:5)
at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:3)
at cp5.run(DispatchedTask.kt:15)
at et5.a(CoroutineScheduler.kt:25)
at et5$a.run(CoroutineScheduler.kt:15)
Caused by: java.lang.ClassCastException: kotlinx.coroutines.android.AndroidExceptionPreHandler cannot be cast to kotlinx.coroutines.internal.MainDispatcherFactory
at qs5.a(MainDispatchers.kt:12)
at qs5.(MainDispatchers.kt:5)
at ep5.a(Dispatchers.kt:1)
at l55.(TaskRunner.kt:1)
at ly0.get(SignupModule_ProvidePresenter$app_mondayStagingFactory.java:3)
at gb5.get(DoubleCheck.java:6)
at l03$d.inject(DaggerAppComponent.java:6)
at dagger.android.DispatchingAndroidInjector.maybeInject(DispatchingAndroidInjector.java:6)
at com.dapulse.dapulse.refactor.regression.signup.SignupTest$$special$$inlined$getSignupDataProviderTestRuleProvider$1$1$1.inject(ActivityUtil.kt:17)
at com.dapulse.dapulse.refactor.regression.signup.SignupTest$$special$$inlined$getSignupDataProviderTestRuleProvider$1$1$1.inject(Unknown Source:2)
at dagger.android.DispatchingAndroidInjector.maybeInject(DispatchingAndroidInjector.java:6)
at com.dapulse.dapulse.DaPulseApp.a(DaPulseApp.java:8)
at bv.inject(Unknown Source:2)
at zm4.a(UserManager.java:306)
at zm4.b(UserManager.java:11)
at com.dapulse.dapulse.refactor.feature.native_signup.NativeSignupActivity.onCreate(NativeSignupActivity.java:3)
at android.app.Activity.performCreate(Activity.java:7144)
at android.app.Activity.performCreate(Activity.java:7135)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)
at androidx.test.runner.MonitoringInstrumentation.callActivityOnCreate(MonitoringInstrumentation.java:2)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2931)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3086)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1816)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6718)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

[tobi512]

Just ran into this issue with v1.1.1 of coroutines. Can be fixed by _either_ updating to v.1.3.5 _or_ adding the following ProGuard/R8 rules in case anyone doesn't want to update:

-keepnames class kotlinx.coroutines.android.AndroidExceptionPreHandler {}
-keepnames class kotlinx.coroutines.android.AndroidDispatcherFactory {}

However, updating to 1.3.5 is the preferred solution here!

[ron-k]

I was using coroutines lib version 1.3.0 when encountered this issue. Updating dependency to 1.3.7:
implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.7'

did not solve the problem. Adding the proguard rules suggested above did the job:

-keepnames class kotlinx.coroutines.android.AndroidExceptionPreHandler {}
-keepnames class kotlinx.coroutines.android.AndroidDispatcherFactory {}

So I guess, the fix is doing both update and Proguard rules

[AnastasiaRainMaker]

I am facing this issue in tests. I am using testImplementation 'org.jetbrains.kotlinx:kotlinx-coroutines-test:1.3.7' and facing the same issue when it worked before the AGP update to 4.0.1 not sure if it is related and also to implementation 'androidx.core:core-ktx:1.3.1' which may be actually it. Tried the pro guard rules but no luck.

Exception in thread "main @coroutine#32" java.lang.IllegalStateException: Module with the Main dispatcher had failed to initialize. For tests Dispatchers.setMain from kotlinx-coroutines-test module can be used
at kotlinx.coroutines.internal.MissingMainCoroutineDispatcher.missing(MainDispatchers.kt:113)
at kotlinx.coroutines.internal.MissingMainCoroutineDispatcher.isDispatchNeeded(MainDispatchers.kt:91)
at kotlinx.coroutines.test.internal.TestMainDispatcher.isDispatchNeeded(MainTestDispatcher.kt:39)
at kotlinx.coroutines.DispatchedContinuationKt.resumeCancellableWith(DispatchedContinuation.kt:285)
at kotlinx.coroutines.intrinsics.CancellableKt.startCoroutineCancellable(Cancellable.kt:26)
at kotlinx.coroutines.BuildersKt__Builders_commonKt.withContext(Builders.common.kt:166)
at kotlinx.coroutines.BuildersKt.withContext(Unknown Source)
at com.heb.ui.menuitem.viewmodel.MenuItemViewModel$onMenuItemReceived$1.invokeSuspend(MenuItemViewModel.kt:72)
at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:56)
at kotlinx.coroutines.test.TestCoroutineDispatcher.dispatch(TestCoroutineDispatcher.kt:50)

[segunfrancis]

I have the same issue. My test passed locally but I got this error
Exception in thread "main" java.lang.IllegalStateException: Module with the Main dispatcher had failed to initialize. For tests Dispatchers.setMain from kotlinx-coroutines-test module can be used at kotlinx.coroutines.internal.MissingMainCoroutineDispatcher.missing(MainDispatchers.kt:113) at kotlinx.coroutines.internal.MissingMainCoroutineDispatcher.isDispatchNeeded(MainDispatchers.kt:91) at kotlinx.coroutines.DispatchedContinuationKt.resumeCancellableWith(DispatchedContinuation.kt:285) at kotlinx.coroutines.intrinsics.CancellableKt.startCoroutineCancellable(Cancellable.kt:26) at kotlinx.coroutines.CoroutineStart.invoke(CoroutineStart.kt:109) at kotlinx.coroutines.AbstractCoroutine.start(AbstractCoroutine.kt:158) at kotlinx.coroutines.BuildersKt__Builders_commonKt.launch(Builders.common.kt:56) at kotlinx.coroutines.BuildersKt.launch(Unknown Source) at kotlinx.coroutines.BuildersKt__Builders_commonKt.launch$default(Builders.common.kt:49) at kotlinx.coroutines.BuildersKt.launch$default(Unknown Source)
I'm using the following dependencies:
implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.8" implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.3.8" testImplementation "org.jetbrains.kotlinx:kotlinx-coroutines-test:1.3.8"

[boylenssen]

I'm using this:

```@ExperimentalCoroutinesApi
class MainCoroutineRule : TestWatcher(), TestCoroutineScope by TestCoroutineScope() {

override fun starting(description: Description?) {
    super.starting(description)
    Dispatchers.setMain(this.coroutineContext[ContinuationInterceptor] as CoroutineDispatcher)
}

override fun finished(description: Description?) {
    super.finished(description)

// Dispatchers.resetMain()
}
}
`` I commentedDisplatchers.resetMain()out, because that felt like it was causing it. starting()andfinished()` are being called before and after each test, I don't know why this needs to be happing.

Not resetting the dispatchers seems ok for me, it shouldn't be an issue as this should always be like this when I run test