Não sei o porque deste erro:

Error: cmd: Command failed with exit code 1 Error output:
FAILURE: Build failed with an exception.

* Where:
Build file 'C:\projetosapp\pesquisa\platforms\android\build.gradle' line: 20

* What went wrong:
A problem occurred evaluating root project 'android'.
> java.lang.UnsupportedClassVersionError: com/android/build/gradle/AppPlugin : Unsupported major.minor version 52.0
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

Já removi o android, já revi as instalações SDK.