[Typo3] Backend probem!

[Henrik Eriksson]

Hi!
I've got this strange error when I go to the backend page. Any
suggestions what's wrong?

Warning: session_start() [function.session-start]:
open(C:\PHP\sessiondata\sess_19d60c2e21c23e8775d3a04273e9e60e, O_RDWR)
failed: No such file or directory (2) in
c:\Inetpub\wwwroot\testsite\typo3\index.php on line 240

Warning: session_start() [function.session-start]: Cannot send session
cookie - headers already sent by (output started at
c:\Inetpub\wwwroot\testsite\typo3\index.php:240) in
c:\Inetpub\wwwroot\testsite\typo3\index.php on line 240

Warning: session_start() [function.session-start]: Cannot send session
cache limiter - headers already sent (output started at
c:\Inetpub\wwwroot\testsite\typo3\index.php:240) in
c:\Inetpub\wwwroot\testsite\typo3\index.php on line 240

//Henrik