Heroku　push際のエラー

$ git push heroku master

remote:  !     ERROR: Basic validation for 'composer.json' failed!
remote:  !     
remote:  !     It must be a valid JSON document compatible with Composer.
remote:  !     
remote:  !     You most likely created or edited the file by hand, and it now
remote:  !     contains a syntax error. Please refer to the documentation at
remote:  !     https://getcomposer.org/doc/ for information on the format.
remote:  !     
remote:  !     You can run 'composer validate' locally on your computer for
remote:  !     further diagnosis. Remember to also always keep your lock file
remote:  !     up to date with any changes according to the instructions at
remote:  !     https://getcomposer.org/doc/01-basic-usage.md
remote: 
remote:  !     Push rejected, failed to compile PHP app.
remote: 
remote:  !     Push failed
remote:  !
remote:  ! ## Warning - The same version of this code has already been built: 973bccca191f28c2bdfbadc223566c51657fa03a
remote:  !
remote:  ! We have detected that you have triggered a build from source code with version 973bccca191f28c2bdfbadc223566c51657fa03a
remote:  ! at least twice. One common cause of this behavior is attempting to deploy code from a different branch.
remote:  !
remote:  ! If you are developing on a branch and deploying via git you must run:
remote:  !
remote:  !     git push heroku <branchname>:main
remote:  !
remote:  ! This article goes into details on the behavior:
remote:  !   https://devcenter.heroku.com/articles/duplicate-build-version
remote: 
remote: Verifying deploy...
remote: 
remote: !       Push rejected to limitless-fortress-15224.
remote: 
To https://git.heroku.com/limitless-fortress-15224.git
 ! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/limitless-fortress-15224.git'