Activity logs
Installation and Configuration
Its probably some string in the skin that is using a variable from the address bar, but in one of the links on the site, that variable is not coming in. eg:
* search for a list of blog posts in the 'cats' category on site.com/a-profile/blog/cats
and the template has
search="blog_post = `$_post.option`"
where $_post.option is 'cats' from the address bar. when someone opens the url that is site.com/a-profile/blog/ and 'cats' doesnt come in, but the template search string is still firing, then you'll end up with
which will trigger that error because you need to search on something.