Fatal Error class-simplepie.php

After updating to BuddyPress 1.5 I get a fatal error when trying to access this subsite:


Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 4194304 bytes) in /home/golfdawg/public_html/wp-includes/class-simplepie.php on line 14403

It was working fine before the BP update. I think I'm using the WP 2011 theme for that site with the AutoBlog plugin and MarketPress.

Can you help me out with this?