history of uses error

History of uses doesn't report any results. Gives the following error:
Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in .../libraries/joomla/database/database/mysql.php on line 344.

is this the history of uses page or report, or both?

It was history of uses. I just tried report and got this
Warning: Invalid argument supplied for foreach() in .../administrator/components/com_awocoupon/models/reports.php on line 486

did you recently upgrade? What version of AwoCoupon are you using? I suspect you are missing a column in a table.

I have Version: 1.3.1 pro installed. I don't know that this ever worked, though. This was my first time looking at these features.