Error message, can't get to dashboard

So, I signed in to WPMUDEV on this site, installed membership 2 and now I can't get to many pages in my dashboard, including the plugins and themes pages, and WPMUDEV dashboard.

I can't uninstall the plugin, that screen won't come up.

This is the error message:

Fatal error: Out of memory (allocated 30670848) (tried to allocate 262242 bytes) in /homepages/1/d186305181/htdocs/unboundedpotential/wp-content/plugins/wpmudev-updates/includes/class-wpmudev-dashboard-site.php on line 997

This is NOT a multisite install, and the hosting (it's a client site) is through 1and1.com

PLEASE HELP! I have a huge project that I need to be able to show my client today.

Also, something has completely messed up the formatting on my home page. My client is going to FREAK OUT.