Form security failed


when we try to login to piwik site we get the following error

Error: Form security failed. Please reload the form and check that your cookies are enabled. If you use a proxy server, you must configure Piwik to accept the proxy header that forwards the Host header. Also, check that your Referer header is sent correctly.

"Warning: session_write_close() [function.session-write-close]: write failed: No space left on device (28) in /opt/lampp/htdocs/piwik/libs/Zend/Session.php on line 691 "

how to resolve this error

any suggestions please.

(vipsoft) #2

You ran out of disk space.

Either switch session db tables or purge your session file directory.