Widget link/Product page error


The default product page from the MarketPress settings page is giving me this error:


Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 71 bytes) in /home/nywriter/public_html/wp-includes/taxonomy.php on line 2603

You can see here at: http://nywriterscoalition.org/bookstore/

I commented out the default menu so I could manage with custom menus at the top, but from the widget on the right when you click on Browse Products » you are taken to this error. What does it mean and how can it be fixed?