Fatal Error message in Products tab

I am having problems with my marketpress install. If I go to the Products tab, it gives me a fatal error and says: Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 24 bytes) in /home/admin/public_html/wp-includes/functions.php on line 3074. I don't know why it would say that because I know I have plenty of room. Any ideas? It's not affecting any other areas of my site. Just the products tab.