Fatal error: Cannot redeclare class authorizenet_cc_aim in /home/hodebutikk/domains/hodebutikk.no/public_html/includes/modules/payment/authorizenet_c

[Guest]

When i test out on www.hodebutikk.no to put a item in my shopping bag this error ocures:

 

Fatal error: Cannot redeclare class authorizenet_cc_aim in /home/hodebutikk/domains/hodebutikk.no/public_html/includes/modules/payment/authorizenet_cc_aim.php on line 13

 

What is the problem?

And how can i fix it?