il2cpp error when building with version ^3.0.1

[OGmetamonkey]

Describe the bug
Tried upgrading to the latest implementation of the flutter unity widget. Previous working implementation was ^0.1.6+8. Getting errors related to il2cpp.

To Reproduce
Steps to reproduce the behavior:

1. Add flutter_unity_widget: ^3.0.1 to the flutter project as specified in the read me, including the addition of 'FlutterUnityPackage-3.0.0.unitypackage.
2. Open in Unity and build to Android
3. Try to build the flutter project to android device in debugger mode.

Expected behavior
Expected the app to build successfully as it did when using flutter unity widget version ^0.1.6+8

Versions
Flutter: 1.22.5
Dart: 2.10.4
Flutter unity widget: 3.0.1
Unity: 2020.1.16f1
Unity Hub: 2.4.2
Android Device: Nexus 5x using Android 8.1.0

Debug Log

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Warning
──────────────────────────────────────────────────────────────────────────────
Your Flutter application is created using an older version of the Android
embedding. It's being deprecated in favor of Android embedding v2. Follow the
steps at
https://flutter.dev/go/android-project-migration
to migrate your project.
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Launching lib/main.dart on Nexus 5X in debug mode...
lib/main.dart
Running il2cpp.exe in workstation GC mode.
il2cpp.exe didn't catch exception: System.Exception: Android NDK r19 or newer not detected at 'null'.
at Unity.IL2CPP.Building.ToolChains.Android.AndroidNDKUtilities..ctor (NiceIO.NPath ndkRootPath, Unity.IL2CPP.Common.Architecture architecture, System.Boolean useDependenciesToolChain) [0x00078] in :0
at Unity.IL2CPP.Building.ToolChains.AndroidToolChain..ctor (Unity.IL2CPP.Common.Architecture architecture, Unity.IL2CPP.Building.BuildConfiguration buildConfiguration, System.Boolean treatWarningsAsErrors, System.Boolean assemblyOutput, System.Boolean useDependenciesToolChain, NiceIO.NPath toolchainPath) [0x00008] in :0
at Unity.IL2CPP.Building.Platforms.AndroidPlatformSupport.MakeCppToolChain (Unity.IL2CPP.Building.BuildingOptions buildingOptions) [0x00000] in :0
at il2cpp.Compilation.CompilationDriver.Run (Unity.IL2CPP.Common.RuntimePlatform platform, Unity.IL2CPP.Building.BuildingOptions buildingOptions) [0x000c0] in <3be9f628f5fa469389bd6a91a579ba8a>:0
at il2cpp.Program.DoRun (System.String[] args, Unity.IL2CPP.Common.RuntimePlatform platform, Unity.IL2CPP.Building.BuildingOptions buildingOptions) [0x0001f] in <3be9f628f5fa469389bd6a91a579ba8a>:0
at il2cpp.Program.Run (System.String[] args, System.Boolean setInvariantCulture) [0x00063] in <3be9f628f5fa469389bd6a91a579ba8a>:0
at il2cpp.Program.Main (System.String[] args) [0x00000] in <3be9f628f5fa469389bd6a91a579ba8a>:0

Unhandled Exception:
System.Exception: Android NDK r19 or newer not detected at 'null'.
at Unity.IL2CPP.Building.ToolChains.Android.AndroidNDKUtilities..ctor (NiceIO.NPath ndkRootPath, Unity.IL2CPP.Common.Architecture architecture, System.Boolean useDependenciesToolChain) [0x00078] in :0
at Unity.IL2CPP.Building.ToolChains.AndroidToolChain..ctor (Unity.IL2CPP.Common.Architecture architecture, Unity.IL2CPP.Building.BuildConfiguration buildConfiguration, System.Boolean treatWarningsAsErrors, System.Boolean assemblyOutput, System.Boolean useDependenciesToolChain, NiceIO.NPath toolchainPath) [0x00008] in :0
at Unity.IL2CPP.Building.Platforms.AndroidPlatformSupport.MakeCppToolChain (Unity.IL2CPP.Building.BuildingOptions buildingOptions) [0x00000] in :0
at il2cpp.Compilation.CompilationDriver.Run (Unity.IL2CPP.Common.RuntimePlatform platform, Unity.IL2CPP.Building.BuildingOptions buildingOptions) [0x000c0] in <3be9f628f5fa469389bd6a91a579ba8a>:0
at il2cpp.Program.DoRun (System.String[] args, Unity.IL2CPP.Common.RuntimePlatform platform, Unity.IL2CPP.Building.BuildingOptions buildingOptions) [0x0001f] in <3be9f628f5fa469389bd6a91a579ba8a>:0
at il2cpp.Program.Run (System.String[] args, System.Boolean setInvariantCulture) [0x00063] in <3be9f628f5fa469389bd6a91a579ba8a>:0
at il2cpp.Program.Main (System.String[] args) [0x00038] in <3be9f628f5fa469389bd6a91a579ba8a>:0
[ERROR] FATAL UNHANDLED EXCEPTION: System.Exception: Android NDK r19 or newer not detected at 'null'.
at Unity.IL2CPP.Building.ToolChains.Android.AndroidNDKUtilities..ctor (NiceIO.NPath ndkRootPath, Unity.IL2CPP.Common.Architecture architecture, System.Boolean useDependenciesToolChain) [0x00078] in :0
at Unity.IL2CPP.Building.ToolChains.AndroidToolChain..ctor (Unity.IL2CPP.Common.Architecture architecture, Unity.IL2CPP.Building.BuildConfiguration buildConfiguration, System.Boolean treatWarningsAsErrors, System.Boolean assemblyOutput, System.Boolean useDependenciesToolChain, NiceIO.NPath toolchainPath) [0x00008] in :0
at Unity.IL2CPP.Building.Platforms.AndroidPlatformSupport.MakeCppToolChain (Unity.IL2CPP.Building.BuildingOptions buildingOptions) [0x00000] in :0
at il2cpp.Compilation.CompilationDriver.Run (Unity.IL2CPP.Common.RuntimePlatform platform, Unity.IL2CPP.Building.BuildingOptions buildingOptions) [0x000c0] in <3be9f628f5fa469389bd6a91a579ba8a>:0
at il2cpp.Program.DoRun (System.String[] args, Unity.IL2CPP.Common.RuntimePlatform platform, Unity.IL2CPP.Building.BuildingOptions buildingOptions) [0x0001f] in <3be9f628f5fa469389bd6a91a579ba8a>:0
at il2cpp.Program.Run (System.String[] args, System.Boolean setInvariantCulture) [0x00063] in <3be9f628f5fa469389bd6a91a579ba8a>:0
at il2cpp.Program.Main (System.String[] args) [0x00038] in <3be9f628f5fa469389bd6a91a579ba8a>:0

FAILURE: Build failed with an exception.

• Where:
  Build file '/Users/me/Development/Project_Repo/project/project_upgrade/android/unityLibrary/build.gradle' line: 51

• What went wrong:
  Execution failed for task ':unityLibrary:BuildIl2CppTask'.

Process 'command '/Applications/Unity/Hub/Editor/2020.1.16f1/Unity.app/Contents/MonoBleedingEdge/bin/mono'' finished with non-zero exit value 1

• Try:
  Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

• Get more help at https://help.gradle.org

BUILD FAILED in 3s
Exception: Gradle task assembleDebug failed with exit code 1
Exited (sigterm)

[OGmetamonkey]

Attempted to fix this by modifying the android/unityLibrary/build.gradle ndk location to the location of my Unity NDK install as follows:

"--tool-chain-path=" + '/Applications/Unity/Hub/Editor/2020.1.16f1/PlaybackEngines/AndroidPlayer/NDK',

With the above "fix", the flutter project will build, but the project crashes when the unity module is created. 'onUnityCreated' is called just before the crash. Debug log below:

I/IL2CPP ( 2304): JNI_OnLoad
I/Choreographer( 2304): Skipped 73 frames! The application may be doing too much work on its main thread.
E/flutter ( 2304): [ERROR:flutter/shell/platform/android/platform_view_android_jni_impl.cc(43)] java.lang.RuntimeException: platformViewsController must be set before attempting to begin the frame
E/flutter ( 2304): at io.flutter.embedding.engine.FlutterJNI.onBeginFrame(FlutterJNI.java:842)
E/flutter ( 2304): at android.os.MessageQueue.nativePollOnce(Native Method)
E/flutter ( 2304): at android.os.MessageQueue.next(MessageQueue.java:325)
E/flutter ( 2304): at android.os.Looper.loop(Looper.java:142)
E/flutter ( 2304): at android.app.ActivityThread.main(ActivityThread.java:6494)
E/flutter ( 2304): at java.lang.reflect.Method.invoke(Native Method)
E/flutter ( 2304): at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
E/flutter ( 2304): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
E/flutter ( 2304):
F/flutter ( 2304): [FATAL:flutter/shell/platform/android/platform_view_android_jni_impl.cc(1228)] Check failed: CheckException(env).
I/flutter ( 2304): Unity is created!!
I/flutter ( 2304): *********************************************
I/flutter ( 2304): ** flutter unity controller setup complete **
I/flutter ( 2304): *********************************************
Lost connection to device.
Exited (sigterm)

[OGmetamonkey]

Update: I attempted to refer to the NDK directory installed by Android Studio SDK Manager as follows:

"--tool-chain-path=" + '/Users/me/Library/Android/sdk/ndk/22.0.6917172',

Same result. Log of attempt to open Unity below.

I/IL2CPP (30164): JNI_OnLoad
I/Choreographer(30164): Skipped 81 frames! The application may be doing too much work on its main thread.
E/flutter (30164): [ERROR:flutter/shell/platform/android/platform_view_android_jni_impl.cc(43)] java.lang.RuntimeException: platformViewsController must be set before attempting to begin the frame
E/flutter (30164): at io.flutter.embedding.engine.FlutterJNI.onBeginFrame(FlutterJNI.java:842)
E/flutter (30164): at android.os.MessageQueue.nativePollOnce(Native Method)
E/flutter (30164): at android.os.MessageQueue.next(MessageQueue.java:325)
E/flutter (30164): at android.os.Looper.loop(Looper.java:142)
E/flutter (30164): at android.app.ActivityThread.main(ActivityThread.java:6494)
E/flutter (30164): at java.lang.reflect.Method.invoke(Native Method)
E/flutter (30164): at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
E/flutter (30164): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
E/flutter (30164):
F/flutter (30164): [FATAL:flutter/shell/platform/android/platform_view_android_jni_impl.cc(1228)] Check failed: CheckException(env).
I/flutter (30164): Unity is created!!
I/flutter (30164): *********************************************
I/flutter (30164): ** flutter unity controller setup complete **
I/flutter (30164): *********************************************
Lost connection to device.
Exited (sigterm)

[OGmetamonkey]

Tried a fresh install and build. Same result.

[ERROR:flutter/shell/platform/android/platform_view_android_jni_impl.cc(43)] java.lang.RuntimeException: platformViewsController must be set before attempting to begin the frame

[khal-it]

any updates @OGmetamonkey . having same problem

[OGmetamonkey]

No @khalithartmann. I downgraded back to version: 0.1.6+8 after wasting a few days on it. Still hoping someone smarter than me figures it out.

[phamtuongvan]

use Unity 2019.4.3f

[Abhishek01039]

Hello @phamtuongvan

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':unityLibrary:BuildIl2CppTask'.
> A problem occurred starting process 'command '/Users/abhishek/Downloads/flutterunity/android/unityLibrary/src/main/Il2CppOutputProject/IL2CPP/build/deploy/netcoreapp3.1/il2cpp.exe''

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 47s
Exception: Gradle task assembleDebug failed with exit code 1
Exited (sigterm)

I am getting this error. So what should I do?

[esentis]

Hello @phamtuongvan

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':unityLibrary:BuildIl2CppTask'.
> A problem occurred starting process 'command '/Users/abhishek/Downloads/flutterunity/android/unityLibrary/src/main/Il2CppOutputProject/IL2CPP/build/deploy/netcoreapp3.1/il2cpp.exe''

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 47s
Exception: Gradle task assembleDebug failed with exit code 1
Exited (sigterm)

I am getting this error. So what should I do?

Getting the exact same error :/

[jsolra]

Hello @phamtuongvan

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':unityLibrary:BuildIl2CppTask'.
> A problem occurred starting process 'command '/Users/abhishek/Downloads/flutterunity/android/unityLibrary/src/main/Il2CppOutputProject/IL2CPP/build/deploy/netcoreapp3.1/il2cpp.exe''

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 47s
Exception: Gradle task assembleDebug failed with exit code 1
Exited (sigterm)

I am getting this error. So what should I do?

I get the same error, too.

unity version: 2020.2.2.1f1
gradle version: 5.6.4

[ROBYER1]

Any updates on this?

[Robinzon100]

https://prnt.sc/1qenetv

[f-mehues]

Hi any updates?

[crisifur19]

The solution is just to change the ndk.dir from "C:\Program Files\Unity\Hub\Editor\2020.1.8f1\Editor\Data\PlaybackEngines\AndroidPlayer\NDK" to "C:/Program Files/Unity/Hub/Editor/2020.1.8f1/Editor/Data/PlaybackEngines/AndroidPlayer/NDK" ; it's a pretty silly error that the compilation seems to throw because a lecture error of directories.