error

app:incrementalReleaseJavaCompilationSafeguard UP-TO-DATE
:app:compileReleaseJavaWithJavac
:app:compileReleaseJavaWithJavac - is not incremental (e.g. outputs have changed, no previous execution, etc.).
/Users/User/Documents/Dev/reactnative/APPNAME/android/app/src/main/java/com/APPNAME/MainApplication.java:5: error: cannot find symbol
import com.facebook.react.ReactApplication;
                         ^
  symbol:   class ReactApplication
  location: package com.facebook.react
/Users/User/Documents/Dev/reactnative/APPNAME/android/app/src/main/java/com/APPNAME/MainApplication.java:6: error: cannot find symbol
import com.facebook.react.ReactNativeHost;
                         ^
  symbol:   class ReactNativeHost
  location: package com.facebook.react
/Users/User/Documents/Dev/reactnative/APPNAME/android/app/src/main/java/com/APPNAME/MainApplication.java:14: error: cannot find symbol
public class MainApplication extends Application implements ReactApplication {
                                                            ^
  symbol: class ReactApplication
/Users/User/Documents/Dev/reactnative/APPNAME/android/app/src/main/java/com/APPNAME/MainApplication.java:16: error: cannot find symbol
  private final ReactNativeHost mReactNativeHost = new ReactNativeHost(this) {
                ^
  symbol:   class ReactNativeHost
  location: class MainApplication
/Users/User/Documents/Dev/reactnative/APPNAME/android/app/src/main/java/com/APPNAME/MainApplication.java:36: error: cannot find symbol
  public ReactNativeHost getReactNativeHost() {
         ^
  symbol:   class ReactNativeHost
  location: class MainApplication
/Users/User/Documents/Dev/reactnative/APPNAME/android/app/src/main/java/com/APPNAME/MainActivity.java:5: error: MainActivity is not abstractand does not override abstract method getPackages() in ReactActivity
public class MainActivity extends ReactActivity {
       ^
/Users/User/Documents/Dev/reactnative/APPNAME/android/app/src/main/java/com/APPNAME/MainApplication.java:16: error: cannot find symbol
  private final ReactNativeHost mReactNativeHost = new ReactNativeHost(this) {
                                                       ^
  symbol:   class ReactNativeHost
  location: class MainApplication
/Users/User/Documents/Dev/reactnative/APPNAME/android/app/src/main/java/com/APPNAME/MainApplication.java:35: error: method does not overrideor implement a method from a supertype
  @Override
  ^
8 errors
:app:compileReleaseJavaWithJavac FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:compileReleaseJavaWithJavac'.
> 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