fedex shipping module

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Warning: Invalid argument supplied for foreach() in /home/thepinkp/public_html/store/includes/modules/shipping/fedexzipzones.php on line 128

 

	
foreach( $retArr as $aquote ){
 $cost = $aquote['zone_cost'];
 $title = $aquote['shiptype_name'];
 $zoneid = $aquote['zone_id'];
 $this->fuel_surcharge = MODULE_SHIPPING_FEDEXZIPZONES_EXPRESS_FUEL_SURCHARGE;
 $service_surcharge = 0;
 $service_discount = 0;

 

thats the error.. how can i get this working?

 

thanks.