8 errors while debugging new react native app Execution failed for task ':app:compileDebugJavaWithJavac'. - React Native

[jebasfrank]

8 errors :app:compileDebugJavaWithJavac FAILED

What went wrong: Execution failed for task ':app:compileDebugJavaWithJavac'.
Compilation failed; see the compiler error output for details.

But old apps are running on my machine, win 8.1 (64) Bit

:app:compileDebugJavaWithJavac - is not incremental (e.g. outputs have changed, no previous execution, etc.). F:\React2\appwn\android\app\src\main\java\com\appwn\MainApplication.java:5: error: cannot find symbol import com.facebook.react.ReactApplication; ^ symbol: class ReactApplication location: package com.facebook.react F:\React2\appwn\android\app\src\main\java\com\appwn\MainApplication.java:6: error: cannot find symbol import com.facebook.react.ReactNativeHost; ^ symbol: class ReactNativeHost location: package com.facebook.react F:\React2\appwn\android\app\src\main\java\com\appwn\MainApplication.java:14: error: cannot find symbol public class MainApplication extends Application implements ReactApplication { ^ symbol: class ReactApplication F:\React2\appwn\android\app\src\main\java\com\appwn\MainApplication.java:16: error: cannot find symbol private final ReactNativeHost mReactNativeHost = new ReactNativeHost(this) { ^ symbol: class ReactNativeHost location: class MainApplication F:\React2\appwn\android\app\src\main\java\com\appwn\MainApplication.java:36: error: cannot find symbol public ReactNativeHost getReactNativeHost() { ^ symbol: class ReactNativeHost location: class MainApplication F:\React2\appwn\android\app\src\main\java\com\appwn\MainActivity.java:5: error: MainActivity is not abstract and does not override abstract method getPackages() in ReactActivity public class MainActivity extends ReactActivity { ^ F:\React2\appwn\android\app\src\main\java\com\appwn\MainApplication.java:16: error: cannot find symbol private final ReactNativeHost mReactNativeHost = new ReactNativeHost(this) { ^ symbol: class ReactNativeHost location: class MainApplication F:\React2\appwn\android\app\src\main\java\com\appwn\MainApplication.java:35: error: method does not override or implement a method from a supertype @OverRide ^ 8 errors :app:compileDebugJavaWithJavac FAILED

FAILURE: Build failed with an exception.

What went wrong: Execution failed for task ':app:compileDebugJavaWithJavac'.

Compilation failed; see the compiler error output for details.

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

BUILD FAILED

[react-native-bot]

We are automatically closing this issue because it does not appear to follow any of the provided issue templates.

Please make use of the bug report template to let us know about a reproducible bug or regression in the core React Native library.

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[jasvinder797]

Execution failed for task ':app:compileDebugJavaWithJavac'