volley框架 出现at com.android.volley.Request.<init>

// 访问网络,初始化详情
        JsonObjectRequest jr = new JsonObjectRequest(Request.Method.GET,
                RequestUrl, null, new Response.Listener<JSONObject>() {

                    @Override
                    public void onResponse(JSONObject json) {
                        hiddenLoading();
                        
                        HandlerData(json,R_code);
                    }

                }, new Response.ErrorListener() {

                    @Override
                    public void onErrorResponse(VolleyError v) {
                        Toast.makeText(mContext,"网络异常 " + v.getMessage(), Toast.LENGTH_LONG).show();
                        showView(0);
                        hiddenLoading();
                    }
                });