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Hi! I'm getting this error after adding `pants.backend.docker` to the list of backend packages:
```ModuleNotFoundError: No module named 'pants.backend.docker.register'
09:50:00.53 [ERROR] Failed to load the pants.backend.docker.register backend: ModuleNotFoundError("No module named 'pants.backend.docker.register'")```
has anybody faced this issue?

upgrading to pants version `2.10.0` fixed the issue :man-shrugging:

If you `git blame src/python/pants/backend/docker/register.py` you hit this commit: <https://github.com/pantsbuild/pants/commit/e7e03012823f0ee3c1a2f71a8271bce6f1277be6>

That is an instance of a pattern where backends start out in the `pants.backend.experimental.X` package and later graduate up to `pants.backend.X`