Smart Crawl Settings Fatal Error

Can't even get to settings on Smart Crawl, when I try, I get:

Fatal error: Allowed memory size of 268435456 bytes exhausted (tried to allocate 83854 bytes) in /home/comicmix/public_html/wp-includes/functions.php on line 340

If I can't even adjust it for potential memory problems, it seems the only thing I can do is deactivate it. Any suggestions?