Unable to add project to ci.gitlab.com

I am trying to add https://gitlab.com/adefran83/blog to ci.gitlab.com however when i click the Add Project to CI button I receive a screen that says 422 The change you wanted was rejected. Maybe you tried to change something you didn't have access to.

I can add all my other projects just fine, it’s just this one I can’t. I used to have a gitlab account but closed it and recently came back.

I changed the name of the repo and it seemed to work just fine, not sure what the problem was/is.