Android : Android volley JSONobject request returns string

I am using following code to make android request:

JsonObjectRequest getRequest = new JsonObjectRequest(Request.Method.GET, url, "{\"jsonrpc\":\"2.0\",\"method\":\"init\",\"params\":[\"5\",\"\",\"\",\"\"],\"id\":0}",
        new Response.Listener<JSONObject>()
        {
            @Override
            public void onResponse(JSONObject response) {
                System.out.println(response);
            }
        },
        new Response.ErrorListener()
        {
            @Override
            public void onErrorResponse(VolleyError error) {
                System.out.println(error);
            }
        }
);
queue.add(getRequest);

}

when I use this request {"jsonrpc":"2.0","method":"init","params":["5","","",""],"id":0} in form it returns this result {"result":{"result":1,"apiKey":"59d8a505d4a1ba0b100e8e8e836c3baf90ac8b9a","motd":"Hello gfxpulse"},"error":null,"id":1,"jsonrpc":"2.0"} however if I try to run mentioned code on android it gives me this error Value <!DOCTYPE of type java.lang.String cannot be converted to JSONObject so it looks like my response is String and not JSON object.

Any ideas? Thanks in forward