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If I leave
```compileSdkVersion = 30```
it will build fine, but we have to migrate to
```compileSdkVersion = 31```
and then these errors. All my google results keep taking me to fixes for :app:
```:unimodules-core:```

As the message say: "see te compiler error output for details".

FWIW, this probably means this is absolutely not related to Gradle or the AGP, so you'd probably better ask in an Android developer forum.

Is there an other error than what I posted

and is there an Android developer forum you recomend?

There should be logs above that one with the compiler error output (if you don't see it in Android Studio, try running the build on the command line, or possibly, IIRC, click around to select the failing task in the build pane).
As for an Android developer forum, I don't do Android development so :man-shrugging:  (sorry)

Generally speaking, the exception is higher up. This is really just where it failed.