Hello,
I deleted some old report categories from our Dynamics 365 on-premise installation, and now I can no longer edit existing or create new reports. Also, System settings is "broken" with the same error (where Report categories are stored).
When I try to create a new report or edit an existing one (Or open System Settings), I see this popup:
And when I click "Try Again" 8 times, I then see this:

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