Ajax request with Play executes success and error (with undefined parameters)

Ajax request with Play executes success and error (with undefined parameters)

I'm trying to get an Ajax request working with Play 2.1/Scala and JQuery.
I followed:
http://www.playframework.com/documentation/2.1.x/ScalaJavascriptRouting
My controller gets called with the correct parameters. But in Javascript,
both success and error callbacks are executed and all parameters are
undefined.
The template:
@(param: String)(implicit req: RequestHeader)
@helper.javascriptRouter("jsRoutes")(
routes.javascript.MyController.myMethod
)
@main("Welcome to Play 2.0") {...}
The javascript function, which is somewhere in this template:
function myFunction(param1, param2, param3) {
jsRoutes.controllers.MyController.myMethod(param1, param2, param3).ajax({
success: new function(data, textStatus, jqXHR) {
console.log("ajax success data: " + data);
console.log("ajax success textStatus: " + textStatus);
console.log("ajax success jqXHR: " + jqXHR);
}, error: new function(jqXHR, textStatus, errorThrown) {
console.log("ajax error xhr: " + jqXHR);
console.log("ajax error textStatus: " + textStatus);
console.log("ajax error errorThrown: " + errorThrown);
}
});
The controller:
def sendVote(param1:String, param2:String, param3:String) = Action {
implicit request =>
Ok(Json.obj({"key" -> "sdfsdfs"}))
}
I debugged this and I can see in the browser's network monitor the request
and the response, which is of type JSON and contains the correct data.
But this is the output of my callbacks:
ajax success data: undefined localhost:9000/:101
ajax success textStatus: undefined localhost:9000/:102
ajax success jqXHR: undefined localhost:9000/:103
ajax error xhr: undefined localhost:9000/:106
ajax error textStatus: undefined localhost:9000/:107
ajax error errorThrown: undefined
I have no idea, I also looked here Scala JavaScript Routing Play Framework
and couldn't find the reason. I also don't see errors in the server or in
the browser.
Thanks.