error msg Warning: session_start() [function.session-start]:

[SpOoki]

hey, when i trying to enter to my gallery:
http://yaron86.typo.co.il/gallery/index.php

there is an error message:
Warning: session_start() [function.session-start]: open(/tmp/6/6/sess_66a6cdeaf3e9c438f4568dd75d8c6e31, O_RDWR) failed: No such file or directory (2) in /vhosts/coil/typo/users/yaron86/public_html/gallery/includes/sessions.php on line 84

and there another error down in the page:
Warning: Unknown: open(/tmp/6/6/sess_66a6cdeaf3e9c438f4568dd75d8c6e31, O_RDWR) failed: No such file or directory (2) in Unknown on line 0

Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (2;/tmp) in Unknown on line 0

i even can't logon to my admin account...

i didn't touched anything
what is the problem and how i can solve it ?

[V@no]

contact your host administrator, the server is not setup properly.

[SpOoki]

thanx a lot
it has been fixed some how

thanx any way