Once upon a time it happens that WordPress throws such errors on the webpage. Usually after adding a comment or editing a post:
Warning: unlink(/var/www/wp/wp-content/cache/wp-cache-6e1b0bf0f16087dd323bcd4f04de75e3.html) [function.unlink]: No such file or directory in
/var/www/wp/wp-content/plugins/wp-cache/wp-cache-phase2.php on line 277
Warning: Cannot modify header information - headers already sent by (output started at /var/www/wp/wp-content/plugins/wp-cache/wp-cache-phase2.php:277) in /var/www/wp/wp-includes/pluggable-functions.php on line 269
It does not happen every time when I add comment, but it;s pretty frustrating. The permissions seem OK (www-data has it all).
May it be a bug in wp-cache or rather my WP instance is misconfigured?