PHP Script Problem

[taliets]

Since I have installed my forum I'm getting this error code at the bottom of each page on my website:

Warning: Unknown(): open(C:\PHP\sessiondata/sess_307128a3fc8e44d8576820b6df4f1dda, 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 hxxp:session.save [nonactive]_path is correct (C:\PHP\sessiondata) in Unknown on line 0

Do you know what this could be and could it have to do with my new forum? You can see what it looks like live (just scroll to the bottom):
hxxp:www.frostedberry.net/Silvia/Index.php [nonactive]

[mindphp]

recheck your server config