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Under Web Interface Logs > Scheduled Email Reports
you will occasionally see an error which reads
"A scheduled email report was attempted but no data was available. Will try again later"
It would be more helpful if the error message gave the site and user of the email report so that the problem could be examined. The default would be to think that this error resulted from an unprocessed log file, but it could also be caused by a configuration error. Without knowing the site and user, there is no way to correct the configuration error.