Fejl på anden server

Warning: Unknown(): Your script possibly relies on a session side-effect which existed until PHP 4.2.3. Please be advised that the session extension does not consider global variables as a source of data, unless register_globals is enabled. You can disable this functionality and this warning by setting session.bug_compat_42 or session.bug_compat_warn to off, respectively. in Unknown on line 0

Forstår den ikke helt... nogen der kan forklare? Virker fint på min lokale server men ikke på den anden... det er når den prøver at gemme en session...