Url request variables problem

programming flash
1

I have a problem .I am trying to load some data from a php script . I want to send some variables to php .


public function LoadXML2(nume:String,c1:String,c2:String,c3:String):void {
            var loader:URLLoader = new URLLoader();
            configureListeners(loader);

            var request:URLRequest = new URLRequest(nume);


            var variables:URLVariables = new URLVariables();

            variables.c1 =c1;
            variables.c2 =c2;
            variables.c3 =c3;

            request.data = variables;
            request.method = URLRequestMethod.POST;
            try {
                loader.load(request);
            } catch (error:Error) {
                trace("Unable to load requested document.");
            }

        }

**

    }**

The problem is that in firefox works , but in IE dont :
in Ie it appears a box:

Error: Error #2101: The String passed to URLVariables.decode() must be a URL-encoded query string containing name/value pairs.
    at Error$/throwError()
    at flash.net::URLVariables/decode()
    at flash.net::URLVariables$iinit()
    at medieval::DataLoader/::OnComplete()
    at flash.events::EventDispatcher/flash.events:EventDispatcher::dispatchEventFunction()
    at flash.events::EventDispatcher/dispatchEvent()
    at flash.net::URLLoader/flash.net:URLLoader::onComplete()

I want to mention that this error appears when I add urlVariables
what should I DO??