Why it gives an error on Heroku?

Why gives this error?
-----> Failed to detect set buildpack https://codon-buildpacks.s3.amazonaws.com/buildpac...
More info: https://devcenter.heroku.com/articles/buildpacks#d...
! Push failed
July 2nd 19 at 18:25
1 answer
July 2nd 19 at 18:27
In settings in selected Buildpacks Python?

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