Incorrect cache engine in Cache.php on line 76

When editing a current post and clicking on update I get the following:

Warning: Incorrect cache engine in /home/psyrendust/webapps/blog_psyrendust_com/wp-content/plugins/w3-total-cache/lib/W3/Cache.php on line 76

Warning: Cannot modify header information - headers already sent by (output started at /home/psyrendust/webapps/blog_psyrendust_com/wp-content/plugins/w3-total-cache/lib/W3/Cache.php:76) in /home/psyrendust/webapps/blog_psyrendust_com/wp-includes/pluggable.php on line 876

http://wordpress.org/extend/plugins/w3-total-cache/