After Reverting Site: Collection cannot be null. Parameter name: c
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I have a dnn 6.2.5 site, that was running fine. I take backups of both files and database for this site.
Recently I tried to update dnn to the latest version and had some errors while updating. So I decided to just revert the files and database back to their working state, or so I thought.
But now I am getting "Collection cannot be null. Parameter name: c" when trying to access the dnn home page, and any other pages. It "appears" to be coming from the PortalController GetPortals method somewhere.
Is there something left over that might have been cached from the failed upgrade or something? I have erased all files and databases before re-uploading the working files and database again. It should be an exact copy of what was working before...