I\'m trying to install berta (v 0.6.3b) and I get this error:
Warning: session_start() [function.session-start]: open(/var/php_sessions/sess_a0d6b84
I think the folder containing the session data cannot be accessed by the PHP process.
If you have not touched your php.ini, the default session.save_handler should be files (which means that session data will be stored in a folder on your file system). The value of session.save_path contains that folder, you should check that it exists and its permissions for your php process.