(GIT) Error with connecting to Remote-Repository

I have a problem with connecting my site to my git repository.

First I created an empty git repository, then i clicked create new site.

I put in the site name and selected the local folder.

After entering the link to the repository and my log-in information I clocked test.

This Error message appears:

I am new to DreamWeaver and Git so I am not really sure what I could do.

I could not find any information to any similar errors online.

It is also very possible I mad some mistake with setting the site and the repository up.