Problem z sesją po podpięciu subdomeny Opcje

[sowi]

Witam,
sytuacja jest nastepujaca. Po wpisaniu dlugiego adresu, czyli www.domena.pl/katalog/typowanie wszystko dziala ok, natomiast po podlaczeniuu subdomeny ktora skierowana jest na katalog typowanie wyskakuje nastewpujacy komunikat:

Warning: session_start() [function.session-start]: open(/tmp/sess_d3e2f8b5ccbc8b2fbb0efe6bc65b1b1f, O_RDWR) failed: No such file or directory (2) in /tescik.php on line 2

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /tescik.php:2) in /tescik.php on line 2

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /tescik.php:2) in /tescik.php on line 2

Warning: Cannot modify header information - headers already sent by (output started at /tescik.php:2) in /tescik.php on line 26

Warning: Unknown(): open(/tmp/sess_d3e2f8b5ccbc8b2fbb0efe6bc65b1b1f, 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 session.save_path is correct (/tmp) in Unknown on line 0" title="Zobacz w manualu PHP" target="_manual

Czy ktos moze mi wyjasnic co moze byc tego przyczyna?