build failed

ReactNativeKatas/android/app/src/main/java/com/reactnativekatas/MainActivity.java:27: error: method does not override or implement a method from a supertype
@Override
^
/code/android/react-native/ignite2/ReactNativeKatas/android/app/src/main/java/com/reactnativekatas/MainActivity.java:36: error: method does not override or implement a method from a supertype
@Override
^
2 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