As already mentioned here, there are some problems with mod building at the moment. It seems like it fails to check for existing versions and throws this error:
FAILURE: Build failed with an exception.
Build file 'F:\Coding\Workspaces\Eclipse\forge-1.12.2-188.8.131.5268-mdk\build.gradle' line: 25
* What went wrong:
A problem occurred evaluating root project 'forge-1.12.2-184.108.40.20668-mdk'.
> No such version exists!
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
Total time: 3.957 secs
Are there any workarounds for it?