Hello ,
I have installed paypal module in my oscommerce configuration.
But when the customer returns after paying on paypal, they recieve the following error

Fatal error: Call to a member function on a non-object in
/home/ragin/public_html/includes/modules/payment/paypal_ipn.php on line 521

So i don't know what the actual problem is.
so if anyone have any idea about this problem then please help....Thanks in Advance....