I am receiving an error message (...could not execute SQL statement...)when I try to run a report with an average of a field.  I have a query that calculates turnaround time between 2 dates using the DateDiff function.  My query runs fine and the report runs fine as well.  I am trying to get an overall average of the turnaround time but when I include that field in the Report Footer section I get the error message.  I have many other reports that perform the same average and run fine.  Any solution to this problem???