Hi there. Suddenly getting an error in checkout. Not sure where to start looking. Would appreciate any advice.

The error message is as follows:

Object of class queryFactoryResult could not be converted to string in /hsphere/local/home/crankyji/weecarediapercompany.com/weecart/includes/functions/functions_general.php on line 660

The URL is www.weecarediapercompany.com