! [remote rejected] master -> master (pre-receive hook declined)

Tasks: TOP => assets:precompile
(See full trace by running task with --trace)
!
! Precompiling assets failed.
!

! Push rejected, failed to compile Ruby app

To [email protected]:tranquil-crag-9767.git
! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to '[email protected]:tranquil-crag-9767.git'

Any ideas why this is happening? I have checked that everything is properly set up, and the connection to git is good.

First try to pull your master from heroku.

$ git pull heroku master
and then push it again. If you are still getting the same error then push your code with force

$ git push heroku master -f