herouku is showing build pack is not compatable when deploying by django app code example

Example: App not compatible with buildpack: https://buildpack-registry.s3.amazonaws.com/buildpacks/heroku/python.tgz

# remote:  !     Push failed
# App not compatible with buildpack: https://buildpack-registry.s3.amazonaws.com/buildpacks/heroku/python.tgz
# remote: !	Push rejected to 
# error: failed to push some refs to 
#  ! [remote rejected] main -> main (pre-receive hook declined)
git push heroku main
Just add requirements.txt # it will fix your error
# Check wheather requirements.txt file exist or not if not you will get relevant error also