My repo https://bitbucket.org/felixschwarz/alembic is unavailable since I stripped a commit from the admin interface.
Our logs show that we failed start your strip command (which is something we run asynchronously) after we set your repo in the "stripping" state (which is why you saw that page).
I've manually reset your repo and so you can use it again.
Now since your strip command failed, you'll have to run that again. Sorry for the inconvenience.