everything was working fine, and I sent an invoice out to a customer, and I got the following:

Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in /home/content/r/c/0/rc03tl/html/independentdevelopment/cms/libraries/joomla/database/database/mysql.php on line 287

with no list entries
please see attached screen shot

I can give super admin + .sql access if neccessary
I am using Joomla 2.5.4
not sure what version of Invoices,
either way I had a working system before - now no access to my invoices 8(

PLease help