When I click the link to add item on the k2 user module I get this error:
SQL=SELECT `catid` FROM jos_k2_additional_categories WHERE `itemID` = {intval()}
I think it is related to the plugin: Additional Categories for K2 because when i disable it add item works.
This completely breaks my site because it based on user generated content.
Does any one know how to fix this or know of any free alternative plugins.
My site is bypassgames.com/
When I click on my page i get a 404 error but I think this is related to my sef settings.

I fixed the second issue but I am still having the main one.

Hi. This query is coming from a third-party extension, not K2. Ask it's developer for help.