Does nay1 know what this stuff mean and how it can be fixed

An error has occurred.:

Cookies do not appear to be enabled on your browser client. You will not be able to install the application with this feature disabled. Alternatively, there could also be a problem with the server's session.save_path. If this is the case, please consult your hosting provider if you don't know how to check or fix this yourself.

Warning: session_write_close() [function.session-write-close]: write failed: No space left on device (28) in /www/zxq.net/s/i/l/(acc name)/htdocs/libraries/joomla/session/session.php on line 546

Warning: session_write_close() [function.session-write-close]: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/var/lib/php5) in /www/zxq.net/s/i/l/(acc name)/htdocs/libraries/joomla/session/session.php on line 546