If there is potential for a reporting problem, File Reporter provides notifications to help resolve the issue. The following points might also be helpful.
Verify that a scan exists for the storage resources you want to report on.
If your built-in reports include too much data to be useful, narrow the scope of the report by implementing filters or by reducing the number of report target paths for built-in reports.
For more information on built-in report filters, see Section 10.5, Built-in Report Filtering.