Проблема c push в git

Недавно я столкнулся со следующей проблемой в git:

$ git stash

$ git checkout -b secbranch

$ git shash pop

$ git push

error: failed to push some refs to 'git@git.assembla.com:myspace.git'

To prevent you from losing history, non-fast-forward updates were rejected

Merge the remote changes before pushing again.  See the 'Note about

fast-forwards' section of 'git push --help' for details.

$ git push origin +HEAD:HEAD

И все заработало нормально.)