app crashes immediately when building master about polkawallet-flutter HOT 5 CLOSED

2020-05-09 19:57:46.790 5393-5393/io.polkawallet.www.polka_wallet I/zygote: Not late-enabling -Xcheck:jni (already on)
2020-05-09 19:57:47.688 5393-5393/io.polkawallet.www.polka_wallet W/zygote: Unexpected CPU variant for X86 using defaults: x86
2020-05-09 19:57:48.593 5393-5393/io.polkawallet.www.polka_wallet D/AndroidRuntime: Shutting down VM
2020-05-09 19:57:48.603 5393-5393/io.polkawallet.www.polka_wallet E/AndroidRuntime: FATAL EXCEPTION: main
    Process: io.polkawallet.www.polka_wallet, PID: 5393
    java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{io.polkawallet.www.polka_wallet/io.polkawallet.www.polkawalletflutter.MainActivity}: java.lang.ClassNotFoundException: Didn't find class "io.polkawallet.www.polkawalletflutter.MainActivity" on path: DexPathList[[zip file "/data/app/io.polkawallet.www.polka_wallet-HXeQsRhT7vmv4V0f283OJQ==/base.apk"],nativeLibraryDirectories=[/data/app/io.polkawallet.www.polka_wallet-HXeQsRhT7vmv4V0f283OJQ==/lib/x86, /data/app/io.polkawallet.www.polka_wallet-HXeQsRhT7vmv4V0f283OJQ==/base.apk!/lib/x86, /system/lib, /vendor/lib]]
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2679)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856)
        at android.app.ActivityThread.-wrap11(Unknown Source:0)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:164)
        at android.app.ActivityThread.main(ActivityThread.java:6494)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
     Caused by: java.lang.ClassNotFoundException: Didn't find class "io.polkawallet.www.polkawalletflutter.MainActivity" on path: DexPathList[[zip file "/data/app/io.polkawallet.www.polka_wallet-HXeQsRhT7vmv4V0f283OJQ==/base.apk"],nativeLibraryDirectories=[/data/app/io.polkawallet.www.polka_wallet-HXeQsRhT7vmv4V0f283OJQ==/lib/x86, /data/app/io.polkawallet.www.polka_wallet-HXeQsRhT7vmv4V0f283OJQ==/base.apk!/lib/x86, /system/lib, /vendor/lib]]
        at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:125)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
        at android.app.Instrumentation.newActivity(Instrumentation.java:1174)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2669)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856) 
        at android.app.ActivityThread.-wrap11(Unknown Source:0) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589) 
        at android.os.Handler.dispatchMessage(Handler.java:106) 
        at android.os.Looper.loop(Looper.java:164) 
        at android.app.ActivityThread.main(ActivityThread.java:6494) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807) 
2020-05-09 19:57:48.671 5393-5445/io.polkawallet.www.polka_wallet I/ResourceExtractor: Found extracted resources res_timestamp-2-1589046102354
2020-05-09 19:57:48.671 5393-5445/io.polkawallet.www.polka_wallet I/ResourceExtractor: Resource version mismatch res_timestamp-2-1589047065488
2020-05-09 19:57:53.474 5393-5445/io.polkawallet.www.polka_wallet I/ResourceExtractor: Extracted baseline resource assets/flutter_assets/kernel_blob.bin
2020-05-09 19:57:53.475 5393-5445/io.polkawallet.www.polka_wallet I/ResourceExtractor: Extracted baseline resource assets/flutter_assets/vm_snapshot_data
2020-05-09 19:57:53.625 5393-5445/io.polkawallet.www.polka_wallet I/ResourceExtractor: Extracted baseline resource assets/flutter_assets/isolate_snapshot_data

C:\flutter\bin\flutter.bat --no-color upgrade
Flutter is already up to date on channel stable
Flutter 1.17.0 • channel stable • https://github.com/flutter/flutter.git
Framework • revision e6b34c2b5c (7 days ago) • 2020-05-02 11:39:18 -0700
Engine • revision 540786dd51
Tools • Dart 2.8.1
Process finished with exit code 0