Git ошибка «Failed to push some refs to...»?

remote:  !     Push failed
remote: Verifying deploy...
remote:
remote: !       Push rejected to project-name.
remote:
To https://git.heroku.com/yoshinobot1.git
 ! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'project-name.git'