Q: Why do I get the error message Invalid use of Null?

A: This message may occur when you try to edit a matter, fee, expense, payment, or adjustment. It also may occur when you try to view or print a bill, a prebill, or a report. When you click OK in response to the error message, RTG Bills exits.

This problem occurs when a record in the database contains bad data. Click here to read about this problem and its solution.