After installing this FLOATING SOCIAL plugin. Everytime

After installing this FLOATING SOCIAL plugin.

Everytime I want to make changes on my plugins that came from WPMU Dev are giving me this error

Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 491520 bytes) in /home/philippi/public_html/wp-admin/menu.php on line 215

Any help please?
Thanks

EDIT: Also I just found out that it affects the other plugins. Same error is being returned.