please help with errors

[J2KGTS6]

I am getting these error warnings and i'm not quite sure what caused it or what to do.. as i have not changed anything in relation to this.

 

Parse error: parse error, unexpected T_RETURN, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /home/hsphere/local/home/doublehe/cuesanddarts.com/admin/includes/classes/shopping_cart.php on line 283

 

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /home/hsphere/local/home/doublehe/cuesanddarts.com/admin/includes/classes/shopping_cart.php:283) in /home/hsphere/local/home/doublehe/cuesanddarts.com/admin/includes/functions/sessions.php on line 67

 

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/hsphere/local/home/doublehe/cuesanddarts.com/admin/includes/classes/shopping_cart.php:283) in /home/hsphere/local/home/doublehe/cuesanddarts.com/admin/includes/functions/sessions.php on line 67