I am facing this issue right now.
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I’m not using ZenValidator or Silverware. So I don’t think this is the issue.
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I’m still searching for the reference deep in the changelog for model indexes.
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I have found this: https://docs.silverstripe.org/en/4/developer_guides/files/file_migration/ but am on Windows and am struggling to run sake as ‘bash’ is not recognised as an internal or external command, operable program or batch file.
I installed wamp and a new version of Silverstripe. I imported all my files and tested and thought they were ready for another level of testing.
I exported my databases from the live version and imported them into the test area and ran dev/build?flush=1.
I think there are content issues in the database for Silverstripe version 3 when migrating to version 4. I’m struggling to find how to fix them.
There seems to be others that have had this problem: Upgrade from 3.4.1 to 4.9
If anyone can point to how to update my databases to work effectively with a new version of Silverstripe, I would heartily appreciate it.