[Plugin: WP Super Cache] Warning: filesize() [function.filesize]: stat failed Error

I followed the instructions and it appears it should be working and I got this error:

Warning: filesize() [function.filesize]: stat failed for /my-path-to/wp-content/cache/wp-cache-231c544118f153dad1fc990b94f3483c.html in /my-path-to/wp-content/plugins/wp-super-cache/wp-cache-phase2.php on line 464

Any ideas?

http://wordpress.org/extend/plugins/wp-super-cache/