Heroku: AttributeError: 'NoneType' object has no attribute 'to_dependency'

[schlich]

• [x] I am on the latest Poetry version.
• [x] I have searched the issues of this repo and believe that this is not a duplicate.
• [x] If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: WSL 2 (Ubuntu 20.04)
• Poetry version: 1.1.2
• Link of a Gist with the contents of your pyproject.toml file: https://gist.github.com/schlich/476f452893fffb365e2737959a5c4fbe

Issue

When deploying to Heroku using the poetry build pack, i get the error message posted in the title at the step -----> Export requirements.txt from Poetry attempting to manually export requirements.txt from poetry and then deploying pointed to pygsheets and oauth2lib as potential culprits:

ERROR: In --require-hashes mode, all requirements must have their versions pinned with ==. These do not
oauth2client from https://files.pythonhosted.org/packages/95/a9/4f25a14d23f0786b64875b91784607c2277eff25d48f915e39ff0cff505a/oauth2client-4.1.3-py2.py3-none-any.whl#sha256=b8a81cc5d60e2d364f0b1b98f958dbd472887acaf1a5b05e21c28c31a2d6d3ac (from pygsheets==2.0.3.1->-r /tmp/build_e17f181a/requirements.txt (line 229))

[schlich]

I think this is an issue with the buildpack, pinning the poetry version to a previous version (1.1.1) did the trick.

related to https://github.com/moneymeets/python-poetry-buildpack/issues/13

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