Cant open Youtube embedded video in second activity from tab layout in android studio

Can't open embedded youtube video api in second activity from my tabbed layout.I can go to second activity if it is not about embedding youtube video and alos i had checked that my embed youtube video api code is not wrong.
Note: I use images with nested scrollview in each fragment.

Here is my codes.

For Frag1

package   com.example.androidy.ui.main;
    
    import android.content.Intent;
    import android.os.Bundle;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.ImageView;
    
    import androidx.annotation.Nullable;
    import androidx.fragment.app.Fragment;
    
    import com.example.androidy.Activity2;
    import com.example.androidy.R;
    
    public class Frag1   extends Fragment {
    
    
        private ImageView img1;
    
    
    
        public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) 
    {
           View v = inflater.inflate(R.layout.frag1_layout, container, false);
           img1 = (ImageView) v.findViewById(R.id.image1);
    
           img1.setOnClickListener(new View.OnClickListener() {
               @Override
               public void onClick(View v) {
                   Intent intent = new Intent(getActivity(), Activity2.class);
                   startActivity(intent);
    
               }
           });
           return v;}
    }

For Activity 2

package com.example.androidy;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;

import com.google.android.youtube.player.YouTubeBaseActivity;
import com.google.android.youtube.player.YouTubeInitializationResult;
import com.google.android.youtube.player.YouTubePlayer;
import com.google.android.youtube.player.YouTubePlayerView;

public class Activity2 extends YouTubeBaseActivity {

    private static final String TAG = "Activity2";

    YouTubePlayerView mYouTubePlayerView;
    Button btnPlay;
    YouTubePlayer.OnInitializedListener mOnInitializedListener;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Log.d(TAG, "onCreate: Starting.");
        btnPlay = (Button) findViewById(R.id.btnPlay);
        mYouTubePlayerView = (YouTubePlayerView) findViewById(R.id.youtubePlay);

        mOnInitializedListener = new YouTubePlayer.OnInitializedListener() {
            @Override
            public void onInitializationSuccess(YouTubePlayer.Provider provider, YouTubePlayer youTubePlayer, boolean b) {
                Log.d(TAG, "onClick: Done initializing.");
                youTubePlayer.loadVideo("smJ2nnVv-DE");

            }
@Override
            public void onInitializationFailure(YouTubePlayer.Provider provider, YouTubeInitializationResult youTubeInitializationResult) {
                Log.d(TAG, "onClick: Failed to Initialize.");
            }


        };
        btnPlay.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Log.i(TAG, "onClick: Initializing YouTube Player.");
                mYouTubePlayerView.initialize(YouTubeConfig.getApiKey(), mOnInitializedListener);
    
            }
        });
    }
}

And Here is my error

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference

P.S:Can Someone plz help me solve this problem.