The one page checkout for my store doesn't complete. On the final step (order review), I get this error as a return from the Ajax call to checkout/onepage/saveOrder:
Server was unable to read request. ---> There is an error in the XML document. ---> Input string was not in a correct format.{"success":true,"error":false}After logging every variable and array I could find in the saveOrderAction method of OnepageController.php, it looks like the redirectUrl from this line is returning nothing:
$redirectUrl = $this->getOnepage()->getCheckout()->getRedirectUrl();
I haven't found anyone else having this exact problem, and I have a feeling this is being caused by some admin setting that I missed while setting my store up. The production site works fine and I've copied every file onto my local server. Any ideas?