Pwk was running, now i get this error on login page

There is an error. Please report the message (Piwik 1.9.1) and full backtrace in the Piwik forums (please do a Search first as it might have been reported already!).

Warning: session_write_close(): Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/var/www/vhosts/default/htdocs/pwk/tmp/sessions) in /var/www/vhosts/default/htdocs/pwk/libs/Zend/Session.php on line 691

Backtrace -->

#0 Piwik_ErrorHandler(…) called at [:]
#1 session_write_close(…) called at [/var/www/vhosts/default/htdocs/pwk/libs/Zend/Session.php:691]
#2 Zend_Session::writeClose(…) called at [:]

Do you get this error every time ? or some time ?

Hello

i get this message everytime. i cant login anymore.

the server is quite new. i cant imagine there is a memory error.

Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/var/www/vhosts/default/htdocs/pwk/tmp/sessions) and that it is writable

hmm.

i can say that this directory exists, it has all possible rights and owner is root.
also there are several session files in this directory yet.
so it did work already, but stopped…

ok. where do i have to make this session.save_path setting?

[solved]

it was a database error…
didnt changed partition-size on new server and so it went full :confused: