[TYPO3] domain name problem

[Rakowski Tomasz]

Hello!

I have the following problem.

I have to different domains: www.mydomain1.com and www.mydomain2.com.
They are both assigned to same point on my server - /
What I want to do is to assign one of them to a selected catogory - 
/development, in which one instalation of Typo3 resides. This redirect 
works fine, so when I type www.mydomain2.com I see content from 
/development.
Problem appears when I want to go to BE of Typo3. When I type in 
www.mydomain2.com/typo3 I get the following errors:

Warning: session_start(): 
open(/tmp/sess_0c7cf988b41022670427961eeea6ea2d, O_RDWR) failed: No such 
file or directory (2) in /typo3/index.php on line 240

Warning: session_start(): Cannot send session cookie - headers already 
sent by (output started at /typo3/index.php:240) in /typo3/index.php on 
line 240

Warning: session_start(): Cannot send session cache limiter - headers 
already sent (output started at /typo3/index.php:240) in 
/typo3/index.php on line 240


It is impossible to login.


hope to get some hints from you.

racco