Fatal error after i activate the Membership plugin

Encountering this error after I activate the plugin:

Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 30720 bytes) in /home/advances/public_html/myadvance/wp-content/plugins/w3-total-cache/lib/W3/Cache/File.php on line 250

Please let me know how to fixed this problem.