tox broken

[jugmac00]

❯ tox -e py37
py37 create: /home/jugmac00/All/output_plone/plone/plone.app.standardtiles/.tox/py37
py37 installdeps: -rrequirements.txt, coverage
ERROR: invocation failed (exit code 1), logfile: /home/jugmac00/All/output_plone/plone/plone.app.standardtiles/.tox/py37/log/py37-1.log
====================================================================================== log start ======================================================================================
ERROR: Could not open requirements file: [Errno 2] No such file or directory: 'requirements.txt'
WARNING: You are using pip version 20.1.1; however, version 21.0.1 is available.
You should consider upgrading via the '/home/jugmac00/All/output_plone/plone/plone.app.standardtiles/.tox/py37/bin/python -m pip install --upgrade pip' command.

======================================================================================= log end =======================================================================================
ERROR: could not install deps [-rrequirements.txt, coverage]; v = InvocationError('/home/jugmac00/All/output_plone/plone/plone.app.standardtiles/.tox/py37/bin/python -m pip install -rrequirements.txt coverage', 1)
_______________________________________________________________________________________ summary _______________________________________________________________________________________
ERROR:   py37: could not install deps [-rrequirements.txt, coverage]; v = InvocationError('/home/jugmac00/All/output_plone/plone/plone.app.standardtiles/.tox/py37/bin/python -m pip install -rrequirements.txt coverage', 1)

I noticed this bug when I ran tox for all Zope/Plone this weekend, see https://jugmac00.github.io/blog/testing-the-tox-4-pre-release-at-scale/

I do not use this package and unfortunately I have no time to fix it.