Fatal Error:

[digginshop]

Hi there, I'm just finishing my web but when I click on the checkout buttom appears this error:

 

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at C:\AppServ\www\tienda\catalog\checkout_shipping.php:1) in C:\AppServ\www\tienda\catalog\includes\functions\sessions.php on line 102

 

Warning: Cannot modify header information - headers already sent by (output started at C:\AppServ\www\tienda\catalog\checkout_shipping.php:1) in C:\AppServ\www\tienda\catalog\includes\functions\general.php on line 33

 

 

When I fix this errors appears this one:

 

Fatal error: Call to undefined function tep_session_name() in /mounted-storage/home51b/sub002/sc34926-DQFK/diggin.es/includes/application_top.php on line 146

 

 

I don't know where's the problem, I can't find anything that fix it.

 

Thanks again.