Something just broke my website....

I just installed the Dashboard, used it to install Membership 2 Pro, and now my site is broken. I can't tell you what version of WP (it's whatever is most recent) because my site won't load. No matter what I click I now get this message:
Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 305155 bytes) in /home/hayesproject/public_html/spellboundboudoir.com/wp-includes/functions.php on line 291