Can't create new app on itunesconnect

I had the same issue. There was an update on the contract / license agreement to review and approve (I had an advice on the iTunes connect main page). I did it. Then I came back to iTunes connect and now I can add a new app.

You may need to logount / login again after approving the new license agreement.

For me, the problem was that my last version was "Developer Rejected", since I had cancelled the submission. I had to delete the old build from that version and add a new uploaded build, and then I could save it (with a new public version number if I wanted) and submit it.