problem after install MAX 1.5

I've got this alert:

Warning: session_start(): open(/tmp\sess_c3222c35241d81dc333c8058127e391f, O_RDWR) failed: No such file or directory (2) in c:\program files\easyphp1-7\www\includes\functions\sessions.php on line 67

Where i must create this /tmp file?

thanks for the help

And i don't know if this problem is in relation with the other but the connection to admin tools with admin@localhost.com ant password: admin don't work. (but it's well this pass in the database, so i don't understand?!?!)

Note this has nothing to do with OSC.....

Easiest thing to do is to store session in MYSQL - change BOTH configure.php files - near the bottom:
define('STORE_SESSIONS', ''); // leave empty '' for default handler or set to 'mysql'
to:
define('STORE_SESSIONS', 'mysql');

To acually correct this properly:
This diretory is set in php.ini - look for 'tmp' there and see exactly where it should be - or chanf to where you would like it to be (NOT in your WEB SERVER directory) - most likly 'c:\tmp' or 'c:\php\tmp' or 'c:\easyphp\php\tmp' or something like that. Make sure the directory exists and for NT/2000/XP/20003 servers has "IUSR" permissions set to read/write/modify to true.

(Sorry it's me - JPF)