react-native APK crash with "Unknown" error - react-native

Question

My react-native developing environment is on Windows 7; worked fine until yesterday, but suddenly the APK reports an error after it loads the bundle.
The error Message:
Unknown
run
NativeRunnable.java
handleCallback
Handler.java:873
dispatchMessage
Handler.java:99
dispatchMessage
MessageQueueThreadHandler.java:29
loop
Looper.java:193
run
MessageQueueThreadImpl.java:232
run
Thread.java:764
I did google for the error, but no luck. I tried clearing the cache using npm start -- --reset-cache, but the error remains.
I found and tried similar posts but their solutions did not work either.
Error Logcat:
06-16 14:30:16.144 5885 6735 E unknown:ReactNative: Exception in native call
06-16 14:30:16.144 5885 6735 E unknown:ReactNative: com.facebook.jni.UnknownCppException: Unknown
06-16 14:30:16.144 5885 6735 E unknown:ReactNative: at com.facebook.react.bridge.queue.NativeRunnable.run(Native Method)
06-16 14:30:16.144 5885 6735 E unknown:ReactNative: at android.os.Handler.handleCallback(Handler.java:873)
06-16 14:30:16.144 5885 6735 E unknown:ReactNative: at android.os.Handler.dispatchMessage(Handler.java:99)
06-16 14:30:16.144 5885 6735 E unknown:ReactNative: at com.facebook.react.bridge.queue.MessageQueueThreadHandler.dispatchMessage(MessageQueueThreadHandler.java:29)
06-16 14:30:16.144 5885 6735 E unknown:ReactNative: at android.os.Looper.loop(Looper.java:193)
06-16 14:30:16.144 5885 6735 E unknown:ReactNative: at com.facebook.react.bridge.queue.MessageQueueThreadImpl$4.run(MessageQueueThreadImpl.java:232)
06-16 14:30:16.144 5885 6735 E unknown:ReactNative: at java.lang.Thread.run(Thread.java:764)
06-16 14:30:16.152 5885 6735 E ReactNativeJNI: Attempting to call JS function on a bad application bundle: RCTDeviceEventEmitter.emit()
06-16 14:30:16.155 5885 6735 E unknown:ReactNative: Exception in native call
06-16 14:30:16.155 5885 6735 E unknown:ReactNative: java.lang.RuntimeException: Attempting to call JS function on a bad application bundle: RCTDeviceEventEmitter.emit()
06-16 14:30:16.155 5885 6735 E unknown:ReactNative: at com.facebook.react.bridge.queue.NativeRunnable.run(Native Method)
06-16 14:30:16.155 5885 6735 E unknown:ReactNative: at android.os.Handler.handleCallback(Handler.java:873)
06-16 14:30:16.155 5885 6735 E unknown:ReactNative: at android.os.Handler.dispatchMessage(Handler.java:99)
06-16 14:30:16.155 5885 6735 E unknown:ReactNative: at com.facebook.react.bridge.queue.MessageQueueThreadHandler.dispatchMessage(MessageQueueThreadHandler.java:29)
06-16 14:30:16.155 5885 6735 E unknown:ReactNative: at android.os.Looper.loop(Looper.java:193)
06-16 14:30:16.155 5885 6735 E unknown:ReactNative: at com.facebook.react.bridge.queue.MessageQueueThreadImpl$4.run(MessageQueueThreadImpl.java:232)
06-16 14:30:16.155 5885 6735 E unknown:ReactNative: at java.lang.Thread.run(Thread.java:764)
06-16 14:30:16.155 5885 6735 E ReactNativeJNI: Attempting to call JS function on a bad application bundle: AppRegistry.runApplication()
06-16 14:30:16.156 5885 6735 E unknown:ReactNative: Exception in native call
06-16 14:30:16.156 5885 6735 E unknown:ReactNative: java.lang.RuntimeException: Attempting to call JS function on a bad application bundle: AppRegistry.runApplication()
06-16 14:30:16.156 5885 6735 E unknown:ReactNative: at com.facebook.react.bridge.queue.NativeRunnable.run(Native Method)
06-16 14:30:16.156 5885 6735 E unknown:ReactNative: at android.os.Handler.handleCallback(Handler.java:873)
06-16 14:30:16.156 5885 6735 E unknown:ReactNative: at android.os.Handler.dispatchMessage(Handler.java:99)
06-16 14:30:16.156 5885 6735 E unknown:ReactNative: at com.facebook.react.bridge.queue.MessageQueueThreadHandler.dispatchMessage(MessageQueueThreadHandler.java:29)
06-16 14:30:16.156 5885 6735 E unknown:ReactNative: at android.os.Looper.loop(Looper.java:193)
06-16 14:30:16.156 5885 6735 E unknown:ReactNative: at com.facebook.react.bridge.queue.MessageQueueThreadImpl$4.run(MessageQueueThreadImpl.java:232)
06-16 14:30:16.156 5885 6735 E unknown:ReactNative: at java.lang.Thread.run(Thread.java:764)
06-16 14:30:16.165 5885 5885 D ReactNative: CatalystInstanceImpl.destroy() start
06-16 14:30:16.181 1571 1571 D gralloc_ranchu: gralloc_alloc: Creating ashmem region of size 3936256
06-16 14:30:16.187 1571 1571 D gralloc_ranchu: gralloc_alloc: Creating ashmem region of size 3936256
06-16 14:30:16.189 5885 6734 D ReactNative: CatalystInstanceImpl.destroy() end
06-16 14:30:16.193 1571 1571 D gralloc_ranchu: gralloc_alloc: Creating ashmem region of size 3936256
06-16 14:30:16.224 5885 5885 D ReactNative: CatalystInstanceImpl.destroy() start
06-16 14:30:16.224 5885 5885 D ReactNative: CatalystInstanceImpl.destroy() start
06-16 14:30:16.233 5885 5885 W unknown:ReactNative: Tried to enqueue runnable on already finished thread: 'js... dropping Runnable.
06-16 14:30:16.233 5885 5885 W MessageQueue: Handler (com.facebook.react.bridge.queue.MessageQueueThreadHandler) {ef3c15} sending message to a Handler on a dead thread
06-16 14:30:16.233 5885 5885 W MessageQueue: java.lang.IllegalStateException: Handler (com.facebook.react.bridge.queue.MessageQueueThreadHandler) {ef3c15} sending message to a Handler on a dead thread
06-16 14:30:16.233 5885 5885 W MessageQueue: at android.os.MessageQueue.enqueueMessage(MessageQueue.java:546)
06-16 14:30:16.233 5885 5885 W MessageQueue: at android.os.Handler.enqueueMessage(Handler.java:745)
06-16 14:30:16.233 5885 5885 W MessageQueue: at android.os.Handler.sendMessageAtTime(Handler.java:697)
06-16 14:30:16.233 5885 5885 W MessageQueue: at android.os.Handler.sendMessageDelayed(Handler.java:667)
06-16 14:30:16.233 5885 5885 W MessageQueue: at android.os.Handler.post(Handler.java:395)
06-16 14:30:16.233 5885 5885 W MessageQueue: at com.facebook.react.bridge.queue.MessageQueueThreadImpl.runOnQueue(MessageQueueThreadImpl.java:70)
06-16 14:30:16.233 5885 5885 W MessageQueue: at com.facebook.react.bridge.ReactContext.runOnJSQueueThread(ReactContext.java:306)
06-16 14:30:16.233 5885 5885 W MessageQueue: at com.facebook.react.uimanager.events.EventDispatcher$ScheduleDispatchFrameCallback.doFrame(EventDispatcher.java:302)
06-16 14:30:16.233 5885 5885 W MessageQueue: at com.facebook.react.modules.core.ReactChoreographer$ReactChoreographerDispatcher.doFrame(ReactChoreographer.java:166)
06-16 14:30:16.233 5885 5885 W MessageQueue: at com.facebook.react.modules.core.ChoreographerCompat$FrameCallback$1.doFrame(ChoreographerCompat.java:84)
06-16 14:30:16.233 5885 5885 W MessageQueue: at android.view.Choreographer$CallbackRecord.run(Choreographer.java:947)
06-16 14:30:16.233 5885 5885 W MessageQueue: at android.view.Choreographer.doCallbacks(Choreographer.java:761)
06-16 14:30:16.233 5885 5885 W MessageQueue: at android.view.Choreographer.doFrame(Choreographer.java:693)
06-16 14:30:16.233 5885 5885 W MessageQueue: at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:935)
06-16 14:30:16.233 5885 5885 W MessageQueue: at android.os.Handler.handleCallback(Handler.java:873)
06-16 14:30:16.233 5885 5885 W MessageQueue: at android.os.Handler.dispatchMessage(Handler.java:99)
06-16 14:30:16.233 5885 5885 W MessageQueue: at android.os.Looper.loop(Looper.java:193)
06-16 14:30:16.233 5885 5885 W MessageQueue: at android.app.ActivityThread.main(ActivityThread.java:6669)
06-16 14:30:16.233 5885 5885 W MessageQueue: at java.lang.reflect.Method.invoke(Native Method)
06-16 14:30:16.233 5885 5885 W MessageQueue: at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
06-16 14:30:16.233 5885 5885 W MessageQueue: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
06-16 14:30:16.251 2042 2042 I GoogleInputMethod: onFinishInput() : Dummy InputConnection bound
06-16 14:30:16.252 2042 2042 I GoogleInputMethod: onStartInput() : Dummy InputConnection bound
06-16 14:30:16.255 5885 5902 D EGL_emulation: eglMakeCurrent: 0xe5dc78a0: ver 2 0 (tinfo 0xe7055d70)
Edit: I have excluded from above log the parts that were the same as when the error was fixed.

Answer 1

After debugging; disabling the #babel/plugin-transform-arrow-functions plugin (version 7.2.0) and then clearing the cache (as suggested in another answer) fixed it for me:
Steps:
Disable the #babel/plugin-transform-arrow-functions plugin, for example, I did just comment it out inside the babel.config.js file, like below:
module.exports = {
presets: ['module:metro-react-native-babel-preset'],
plugins: [
['#babel/plugin-proposal-decorators', { decoratorsBeforeExport: false }],
// Below plugin is unable to handle some of our arrow-functions,
// which results in "Unknown" error after the app is launched.
// ```
// ['#babel/plugin-transform-arrow-functions', { spec: true }]
// ```
]
};
When the Packager is already running, close and/or terminate it using process-manager
For react-native init approach (without expo), run:
npm start -- --reset-cache
(those who are using expo-cli should instead of above run expo start -c)
Above mentioned command is for me equal to removing the %temp%/metro-cache directory.
But still, cannot hurt to delete the ~/.babel.json file (on Windows %userProfile%/.babel.json file) as suggested here, I mean, I have tested and the above-mentioned command did not remove and/or change the .babel.json file.
Logcat after fixed:
06-16 14:55:48.670 5885 6650 D ReactNative: CatalystInstanceImpl.destroy() end
06-16 14:55:49.374 5885 6652 W ReactNativeJS: Require cycle: node_modules\react-native-reanimated\src\utils.js -> node_modules\react-native-reanimated\src\core\AnimatedBlock.js -> node_modules\react-native-reanimated\src\utils.js
06-16 14:55:49.374 5885 6652 W ReactNativeJS:
06-16 14:55:49.374 5885 6652 W ReactNativeJS: Require cycles are allowed, butcan result in uninitialized values. Consider refactoring to remove the need fora cycle.
06-16 14:55:49.374 5885 6652 W ReactNativeJS: Require cycle: node_modules\react-native-reanimated\src\base.js -> node_modules\react-native-reanimated\src\core\AnimatedCond.js -> node_modules\react-native-reanimated\src\utils.js -> node_modules\react-native-reanimated\src\core\AnimatedValue.js -> node_modules\react-native-reanimated\src\base.js
06-16 14:55:49.374 5885 6652 W ReactNativeJS:
06-16 14:55:49.374 5885 6652 W ReactNativeJS: Require cycles are allowed, butcan result in uninitialized values. Consider refactoring to remove the need fora cycle.
06-16 14:55:49.374 5885 6652 W ReactNativeJS: Require cycle: node_modules\react-native-reanimated\src\utils.js -> node_modules\react-native-reanimated\src\core\AnimatedValue.js -> node_modules\react-native-reanimated\src\utils.js
06-16 14:55:49.374 5885 6652 W ReactNativeJS:
06-16 14:55:49.374 5885 6652 W ReactNativeJS: Require cycles are allowed, butcan result in uninitialized values. Consider refactoring to remove the need fora cycle.
06-16 14:55:49.375 5885 6652 W ReactNativeJS: Require cycle: node_modules\react-native-reanimated\src\core\AnimatedValue.js -> node_modules\react-native-reanimated\src\derived\evaluateOnce.js -> node_modules\react-native-reanimated\src\core\AnimatedValue.js
06-16 14:55:49.375 5885 6652 W ReactNativeJS:
06-16 14:55:49.375 5885 6652 W ReactNativeJS: Require cycles are allowed, butcan result in uninitialized values. Consider refactoring to remove the need fora cycle.
06-16 14:55:49.375 5885 6652 W ReactNativeJS: Require cycle: node_modules\react-native-reanimated\src\base.js -> node_modules\react-native-reanimated\src\core\AnimatedCond.js -> node_modules\react-native-reanimated\src\utils.js -> node_modules\react-native-reanimated\src\core\AnimatedValue.js -> node_modules\react-native-reanimated\src\derived\evaluateOnce.js -> node_modules\react-native-reanimated\src\base.js
06-16 14:55:49.375 5885 6652 W ReactNativeJS:
06-16 14:55:49.375 5885 6652 W ReactNativeJS: Require cycles are allowed, butcan result in uninitialized values. Consider refactoring to remove the need fora cycle.
06-16 14:55:49.375 5885 6652 W ReactNativeJS: Require cycle: node_modules\react-native-reanimated\src\base.js -> node_modules\react-native-reanimated\src\core\AnimatedCond.js -> node_modules\react-native-reanimated\src\utils.js -> node_modules\react-native-reanimated\src\core\AnimatedValue.js -> node_modules\react-native-reanimated\src\derived\interpolate.js -> node_modules\react-native-reanimated\src\base.js
06-16 14:55:49.375 5885 6652 W ReactNativeJS:
06-16 14:55:49.375 5885 6652 W ReactNativeJS: Require cycles are allowed, butcan result in uninitialized values. Consider refactoring to remove the need fora cycle.
06-16 14:55:49.478 5885 6652 I ReactNativeJS: Running application "StormHoundsApp" with appParams: {"rootTag":201}. __DEV__ === true, development-level warning are ON, performance optimizations are OFF
06-16 14:55:49.749 5885 5885 I ReactNative: [GESTURE HANDLER] Initialize gesture handler for root view com.swmansion.gesturehandler.react.RNGestureHandlerEnabledRootView{32e1596 V.E...... ......ID 0,0-768,1136 #c9}
06-16 14:55:51.469 1831 1854 W audio_hw_generic: Not supplying enough data toHAL, expected position 5387280 , only wrote 5234400
06-16 14:55:52.561 1912 2108 I GnssLocationProvider: WakeLock acquired by sendMessage(REPORT_SV_STATUS, 0, com.android.server.location.GnssLocationProvider$SvStatusInfo#b89f9d4)
06-16 14:55:52.562 1912 1926 I GnssLocationProvider: WakeLock released by handleMessage(REPORT_SV_STATUS, 0, com.android.server.location.GnssLocationProvider$SvStatusInfo#b89f9d4)
06-16 14:55:52.566 2537 2951 W ctxmgr : [AclManager]No 2 for (accnt=account#-517948760#, com.google.android.gms(10015):IndoorOutdoorProducer, vrsn=13280000,0, 3pPkg = null , 3pMdlId = null , pid = 2537). Was: 3 for 57, account#-517948760#
To have a cleaner log, I have excluded from above the parts that were the same as when the error was present.

Answer 2

In my case I stoped metro, cleaned the watchman list:
watchman watch-del-all
and started it again, with the --reset-cache parameter:
react-native start --reset-cache
After deploying the app once more, the error was gone. I didn't need to do anything else.
I think some java files got corrupted (perhaps a racing condition, between updatas?) and nothing else seemed to trigger the recreation of those files again.