Fatal error: Uncaught exception 'Zend_Service_Exception' with message 'Your request should have atleast 1 of the following parameters: Signature, Timestamp. (AWS.MinimumParameterRequirement)' in /home/library/Custom/Service/AmazonCart.php:223 Stack trace: #0 /home/library/Custom/Service/AmazonCart.php(93): Custom_Service_AmazonCart::_checkErrors(Object(DOMDocument)) #1 /home/library/Custom/Service/Amazon/CartQueries.php(12): Custom_Service_AmazonCart->Cart('CartCreate', Array) #2 /home/applications/wfur/store/controllers/CartController.php(24): Custom_Service_Amazon_CartQueries->cartCreate(Array) #3 /home/library/Zend/Controller/Action.php(392): store_CartController->addAction() #4 /home/library/Zend/Controller/Dispatcher/Standard.php(211): Zend_Controller_Action->dispatch('addAction') #5 /home/library/Zend/Controller/Front.php(750): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http)) #6 /home/www/wfur/index.php(56): Zend_Controller_Front->dispatch() # in /home/library/Custom/Service/AmazonCart.php on line 223