Plone 6 Classic with Mosaic - No module named 'plone.app.layout.navigation.defaultpage'

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Testing an addon in a pip instance

My steps to create an addon with installation of Plone 6. mkdir testfolder cd testfolder python -m venv ./venv source venv/bin/activate touch requirements.txt touch constraints.txt touch instance.yaml edit the requirements.txt vim requirements.txt -c constraints.txt wheel # mr.bob checkout only needed if python 3.10 git+https://github.com/collective/mr.bob.git@master plonecli cookiecutter mxdev zope.testrunner Plone edit the constraints.txt vim constraints.txt # add the following line to …