3827067 - Error: This expense report cannot be submitted until all exceptions with red flags are resolved.

When trying to submit an expense report, I get an error message saying, "This expense report cannot be submitted until all exceptions with red flags are resolved. To view the report-level exceptions, click the Report Header link. To view the entry-level exceptions, click the expense type (link) associated with the flag. To view the exceptions associated with itemized expenses, click the View Itemization link associated with the flag."
There are no red flags detected in the report. How can I resolve this?

Error: This expense report cannot be submitted until all exceptions with red flags are resolved. , KBA , CON-EXP-ADM-AUR , Audit Rules , Problem