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A Command Group action added to a projection (e.g. to generate a report) fails with a generic 'Database error occurred. Contact administrator' message with no other detail, even though the exact same underlying method works fine when called from a custom RMB menu in the older EE client, and removing the method's parameters doesn't change the error.

Answer

Capture the full server-side debug detail via a browser HAR export: enable Debug in the client, open Chrome DevTools (F12), reproduce the error, then export the Network/Server tab activity as a .har file. That file contains the complete request/response data from the server (including the actual underlying error the generic client-side message is hiding) — reviewing it (after scrubbing any confidential data) is the way to get from a generic 'Database error occurred' message to the actual root cause, since the client-side error text alone doesn't include enough detail to diagnose this kind of Command Group failure.

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