Ningún adaptador adjunto; saltándose el diseño: RecyclerView (con adaptador)

public class ListPetientFragment extends Fragment {

private String URLstring = "http://192.168.43.29:8080/emedical/list.php";
private static ProgressDialog mProgressDialog;
ArrayList<datamodel> dataModelArrayList;
RvAdapter rvAdapter;
RecyclerView recyclerView;

@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View v = inflater.inflate(R.layout.fragment_list,container,false);
    recyclerView = (RecyclerView) v.findViewById(R.id.recycler);
    fetchingJSON();
    return v;
}

private void fetchingJSON() {

    StringRequest stringRequest = new StringRequest(Request.Method.GET, URLstring,
            new Response.Listener<string>() {
                @Override
                public void onResponse(String response) {

                    Log.d("strrrrr", ">>" + response);

                    try {
                        JSONObject obj = new JSONObject(response);
                        if(obj.optString("selected").equals("selected")){

                            dataModelArrayList = new ArrayList<>();
                            JSONArray dataArray  = obj.getJSONArray("code1");

                            for (int i = 0; i < dataArray.length(); i++) {

                                DataModel playerModel = new DataModel();
                                JSONObject dataobj = dataArray.getJSONObject(i);

                                playerModel.setNames(dataobj.getString("names"));
                                playerModel.setPhone(dataobj.getString("phoneNumber"));
                                playerModel.setDisease(dataobj.getString("disease"));
                                dataModelArrayList.add(playerModel);
                            }
                            setupRecycler();
                        }

                    } catch (JSONException e) {
                        e.printStackTrace();
                    }
                }
            },
            new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    //displaying the error in toast if occurrs
                    Toast.makeText(getActivity(), error.getMessage(), Toast.LENGTH_SHORT).show();
                }
            });

    // request queue
    RequestQueue requestQueue = Volley.newRequestQueue(getActivity());

    requestQueue.add(stringRequest);

}
private void setupRecycler(){
    rvAdapter = new RvAdapter(getContext(),dataModelArrayList);
    rvAdapter.notifyDataSetChanged();
    recyclerView.setAdapter(rvAdapter);
    recyclerView.setLayoutManager(new LinearLayoutManager(getContext(), LinearLayoutManager.VERTICAL, false));

}

}

Error es:
2021-11-17 18:41:02.417 29997-29997/? E/rtphonemedicat: Unknown bits set in runtime_flags: 0x8000
2021-11-17 18:41:03.628 29997-30029/com.nigoote.smartphonemedicate E/GED: Failed to get GED Log Buf, err(0)
2021-11-17 18:41:03.698 29997-30029/com.nigoote.smartphonemedicate E/ion: ioctl c0044901 failed with code -1: Invalid argument
2021-11-17 18:41:13.899 29997-29997/com.nigoote.smartphonemedicate E/RecyclerView: No adapter attached; skipping layout

¡Gracias de antemano!