Invoice Error

[dapper]

Hi All

 

Trying to customise my first shop and i've just checked the invoice layout and there is an error message. I've no experience of MySQL so i'm hoping someone can tell me what it means!

 

Error Message:

 

Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in /homepages/39/d118852182/htdocs/GB/catalog/admin/includes/functions/database.php on line 99

 

Line 99 of database.php:

 

return mysql_fetch_array($db_query, MYSQL_ASSOC);

 

If it helps i've added PayPal IPN v3.0, Nochex APC and i was just trying to add one of the improved invoice/packing slip contributions when i noticed this.

 

Any assistance greatly appreciated