Custom blocs don't work

I've tried to create a custom bloc with BDCraft cubik, but when i add it in mcreator, the console don't compile automaticly, and when i do it in manual, it send me this error :

"1 error
:compileJava FAILED
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':compileJava'.
> 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"