Problem with git: remote 'refs/heads/master' is not an ancestor of local 'refs/heads/master'

I faced to a situation which I don't understand. I have a remote git repo running on WebDAV / apache. Just to be sure, I logged on the server and run "chown -R wwwrun:www *" and "git update-server-info" on the relevant directory (as root, obviously).

Now, I do:

git clone http://myserver/myrepo

then:

$git remote show origin
* remote origin
  Fetch URL: http://myserver/myrepo
  Push  URL: http://myserver/myrepo
  HEAD branch: master
  Remote branches:
    master   tracked
    trunk    tracked
    trunk2.0 tracked
  Local branch configured for 'git pull':
    master merges with remote master
  Local ref configured for 'git push':
    master pushes to master (fast-forwardable)

and then I change any file, stage, commit and try to push, which results in:

error: remote 'refs/heads/master' is not an ancestor of
local 'refs/heads/master'.

Ob开发者_JS百科viously, any attempt to pull is pointless:

$git pull
Already up-to-date.

The repository was just fine a few days ago. How can I work with it again?

---

OK, so I resolved the problem as I wrote in a comment. I used one of the local repositories to make a bare remote repo and everyone else got synchronized with it.