Login problemer

Jeg har gennem dreamweaver prøvet at lave et login, men får følgende fejl:
Warning: session_start(): open(/tmp\sess_abeeea27d798181c86eecc72ff43d43c, O_RDWR) failed: No such file or directory (2) in e:\apache\apache\vhosts\props\doks\login.php on line 4

Warning: session_start(): Cannot send session cookie - headers already sent by (output started at e:\apache\apache\vhosts\props\doks\login.php:4) in e:\apache\apache\vhosts\props\doks\login.php on line 4

Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at e:\apache\apache\vhosts\props\doks\login.php:4) in e:\apache\apache\vhosts\props\doks\login.php on line 4

Warning: Unknown(): open(/tmp\sess_abeeea27d798181c86eecc72ff43d43c, 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

Man kan se dokumentet her:
http://tommashviid.dyndns.dk/doks/

Jeg er endnu ikke den store haj til dette, men prøver at forstå og lære :-)