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From error:

Could not PUT '<https://gitlab.com/api/v4/projects/numOfProjectXXX/packages/maven/com/xxxYYY/nameOfProject/nameOfLibrary/0.1.4-beta04/nameOfLibrary-0.1.4-beta04.aar.sha1>'. Received status code 500 from server: Internal Server Error

It looks like Gitlab has issues and returns 500. 5xx errors are server errors. So maybe Gitlab has issues or it has changed the API.

Ok thanks for you sight!