I am facing a problem during upload product photo, I trying to upload a product file through /Content/Flash/uploadify.swf, and it is able to upload to server, the only problem happen after i clicked "Add picture", the system return me "Error! The requested url did not return json.". after having this error, we will keep getting the same error message for that product, and the photo image list is not able to load and we were not be able to edit and save the detail