When im calling a method to load more data from another class it says it says layout manager is null

Question

So im working on project which shows memes and it loads em from an API, so now theres a main menu to select categories so when i click on a particular category, the fragment transactions to a new fragment and then it loads memes by a method written in ExploreFragment -

package com.example.memeit;

import static com.android.volley.VolleyLog.TAG;

import android.content.Context;
import android.os.Bundle;

import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.Adapter;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonObjectRequest;
import com.android.volley.toolbox.Volley;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.ArrayList;
import java.util.List;

/**
 * A simple {@link Fragment} subclass.
 * Use the {@link ExploreFragment#newInstance} factory method to
 * create an instance of this fragment.
 */
public class ExploreFragment extends Fragment{

    // TODO: Rename parameter arguments, choose names that match
    // the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
    private static final String ARG_PARAM1 = "param1";
    private static final String ARG_PARAM2 = "param2";

    // TODO: Rename and change types of parameters
    private String mParam1;
    private String mParam2;
    public String BASEURL = "https://meme-api.herokuapp.com/gimme/30";
    public TextView tv1_likes;
    public RecyclerView rcv1_explore;
    public Context context;
    public ArrayList<exploreclass> list;
    public boolean isScrolling = false;
    public LinearLayoutManager manager;
    public explore_adapter adapter;
    int currentItems, totalItems, scrolledOutItems;

    public ExploreFragment() {
        // Required empty public constructor
    }

    /**
     * Use this factory method to create a new instance of
     * this fragment using the provided parameters.
     *
     * @param param1 Parameter 1.
     * @param param2 Parameter 2.
     * @return A new instance of fragment ExploreFragment.
     */
    // TODO: Rename and change types and number of parameters
    public static ExploreFragment newInstance(String param1, String param2) {
        ExploreFragment fragment = new ExploreFragment();
        Bundle args = new Bundle();
        args.putString(ARG_PARAM1, param1);
        args.putString(ARG_PARAM2, param2);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            mParam1 = getArguments().getString(ARG_PARAM1);
            mParam2 = getArguments().getString(ARG_PARAM2);
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View view = inflater.inflate(R.layout.fragment_explore, container, false);
        tv1_likes =(TextView) view.findViewById(R.id.tv1_explore);
        list = new ArrayList<>();
        manager = new LinearLayoutManager(getContext());
        adapter = new explore_adapter(list, getContext());
        rcv1_explore =(RecyclerView) view.findViewById(R.id.rcv_explore);
        rcv1_explore.setHasFixedSize(true);
        rcv1_explore.addOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrollStateChanged(@NonNull RecyclerView recyclerView, int newState) {
                super.onScrollStateChanged(recyclerView, newState);
                if(newState == AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL) {
                    isScrolling = true;
                }
            }

            @Override
            public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
                super.onScrolled(recyclerView, dx, dy);

                totalItems = manager.getItemCount();
                currentItems = manager.getChildCount();
                scrolledOutItems = manager.findFirstVisibleItemPosition();


                if(isScrolling && (totalItems == currentItems + scrolledOutItems)) {
                    isScrolling = false;
                    fetchMoreData();
                }
            }
        });

        return view;
    }


    public void ExtractMemes(Context context, String url) {
        RequestQueue queue = Volley.newRequestQueue(context);
        JsonObjectRequest response = new JsonObjectRequest(Request.Method.GET, url, null, new Response.Listener<JSONObject>() {
            @Override
            public void onResponse(JSONObject response) {
                try {
                    JSONArray memes_array = response.getJSONArray("memes");
                    for(int i=0; i<memes_array.length(); i++) {
                        JSONObject memes_object = memes_array.getJSONObject(i);

                        exploreclass class_object = new exploreclass();
                        class_object.setUps(memes_object.getInt("ups"));
                        class_object.setUrl(memes_object.getString("url"));
                        class_object.setPostLink(memes_object.getString("postLink"));
                        list.add(class_object);
                    }
                } catch (JSONException e) {
                    e.printStackTrace();
                }
                rcv1_explore.setLayoutManager(manager);
                rcv1_explore.setAdapter(adapter);
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                Toast.makeText(getContext(), error.getLocalizedMessage(), Toast.LENGTH_SHORT).show();
            }
        });

        queue.add(response);

    }



    private void fetchMoreData() {

        RequestQueue queue = Volley.newRequestQueue(getContext());
        JsonObjectRequest response = new JsonObjectRequest(Request.Method.GET, BASEURL, null, new Response.Listener<JSONObject>() {
            @Override
            public void onResponse(JSONObject response) {

                try {
                    JSONArray memes_array = response.getJSONArray("memes");
                    for(int i=0; i<memes_array.length(); i++) {
                        JSONObject memes_object = memes_array.getJSONObject(i);

                        exploreclass class_object = new exploreclass();
                        class_object.setUps(memes_object.getInt("ups"));
                        class_object.setUrl(memes_object.getString("url"));
                        class_object.setPostLink(memes_object.getString("postLink"));
                        list.add(class_object);
                        adapter.notifyDataSetChanged();
                        Toast.makeText(getContext(), "Success", Toast.LENGTH_SHORT).show();
                    }
                } catch (JSONException e) {
                    e.printStackTrace();
                }

            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                Toast.makeText(getContext(), error.getLocalizedMessage(), Toast.LENGTH_SHORT).show();
            }
        });

        queue.add(response);

    }

}

so now when i call this method ExtractMemes in another class to load memes after transaction it says -

java.lang.NullPointerException: Attempt to invoke virtual method 'void androidx.recyclerview.widget.RecyclerView.setLayoutManager(androidx.recyclerview.widget.RecyclerView$LayoutManager)' on a null object reference
        at com.example.memeit.ExploreFragment$2.onResponse(ExploreFragment.java:154)
        at com.example.memeit.ExploreFragment$2.onResponse(ExploreFragment.java:137)

this is how i access the method -

if(position == 0){
            FragmentTransaction transaction = getChildFragmentManager().beginTransaction();
            ExploreFragment exploreFragment = new ExploreFragment();
            exploreFragment.list = new ArrayList<>();
            exploreFragment.manager = new LinearLayoutManager(getContext());
            transaction.replace(R.id.framelayout, exploreFragment);
            exploreFragment.ExtractMemes(getContext(), "https://meme-api.herokuapp.com/gimme/HistoryMemes/50");

        }