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If the database is not there, then the problem is that the database has not been uploaded to the API. This can be because of a bad definition in the fields and relations to the specific report or because the API module is not installed (SQLite FastReport Module).
Other options:
If none of the options above solve the problem, it’s also possible to remove the try, except code from the method execute_report() from the classEqFastReportSQL. This will help you to debug and see where comes the error from.