volley解析问题出现异常

我用volley解析数据时出现这样的异常，Value of type java.lang.String cannot be converted to JSONObject

应该是我的url里面有html标签，这要怎么解析

final RequestQueue requestQueue = Volley.newRequestQueue(MainActivity.this);
JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(url, null, new Response.Listener() {
@Override
public void onResponse(JSONObject response) {
Log.d("TAG", response.toString());
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.e("TAG", error.getMessage(), error);
}
});
requestQueue.add(jsonObjectRequest);

是不是请求的返回值不是Json格式的啊！