Fatal error while activating the Ultimate Facebook plugin.

I just encountered this error while activating the Ultimate Facebook plugin:

Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 30720 bytes) in /home/s1008356/public_html/wp-content/plugins/wpmu-dev-facebook/lib/class_wdfb_model.php on line 39

Any suggestions on resolving this?

Thanks ... Michael