Git not pushing project

Hi, I was using github to with my maven project but now I need to move my project over to bitbucket. I changed the remote to my bitbucket url but when I try to push I get this error:

hint: Updates were rejected because the remote contains work that you do
To https://bitbucket.org/sometext/mygit.git
hint: not have locally. This is usually caused by another repository pushing
! refs/heads/master:refs/heads/master [rejected] (fetch first)
hint: to the same ref. You may want to first integrate the remote changes
Done
hint: (e.g., 'git pull ...') before pushing again.
hint: See the 'Note about fast-forwards' in 'git push --help' for details.

When I try to pull I get the error:

 * branch master -> FETCH_HEAD
 * [new branch] master -> origin/master
fatal: refusing to merge unrelated histories

When I try to add the files, commit, push and pull from the terminal in intellij it works fine, even when I do a git pull with--allow-unrelated-histories it works in the terminal but when i try to pull or push in intellij I get the same errors. How can I get the builtin git to work with bitbucket instead of using the terminal?

I even did a git fetch, git merge and I get the same errors.