Many remote workspace errors

Hi, I'm trying to make a remote workspace with me and someone else in it.

I encountered a lot of errors like "Remote workspace not empty" and other ones.

These errors happen when I try to connect to the remote workspace, to sync my workspace or when I try to send commits.
The repository is already created, it has all the files a workspace needs and there are already elements in it. My GitHub account is also connected to the repository (I didn't create it)