Crash در برنامه ضبط ویدئو

سلام دوستان ممنون میشم راهنماییم کنید بنده یک برنامه ضبط ویدئو از اینترنت گرفتم و طبق گفته هاش عمل کردم هیچ اروری نداشت اما crash میکنه و هنوز اجرا نشده error میده و پنجره رو میبنده براتون همه قسمتاش رو میذارم ممنون میشم راهنماییم کنین

 package Kazemi.Sam.course.app.my_spy_camera_test;

import java.io.File;
import java.io.IOException;
import android.app.Activity;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.media.CamcorderProfile;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.widget.Button;
import android.widget.Toast;


public class My_Camera_Helper extends Activity implements SurfaceHolder.Callback {

    private SurfaceHolder surfaceHolder;
    private SurfaceView   surfaceView;
    public MediaRecorder  mrec           = new MediaRecorder();
    private Button        startRecording = null;

    File                  video;
    private Camera        mCamera;


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.camera_surface1);
        Log.i("LOG", "Video starting");
        startRecording = (Button) findViewById(R.id.buttonstart);
        mCamera = Camera.open();
        surfaceView = (SurfaceView) findViewById(R.id.surface_camera);
        surfaceHolder = surfaceView.getHolder();
        surfaceHolder.addCallback(this);
        surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu)
    {
        menu.add(0, 0, 0, "StartRecording");
        menu.add(0, 1, 0, "StopRecording");
        return super.onCreateOptionsMenu(menu);
    }


    @Override
    public boolean onOptionsItemSelected(MenuItem item)
    {
        switch (item.getItemId())
        {
            case 0:
                try {
                    startRecording();
                }
                catch (Exception e) {
                    String message = e.getMessage();
                    Log.i(null, "Problem Start" + message);
                    mrec.release();
                }
                break;

            case 1: //GoToAllNotes
                mrec.stop();
                mrec.release();
                mrec = null;
                break;

            default:
                break;
        }
        return super.onOptionsItemSelected(item);
    }


    protected void startRecording() throws IOException
    {
        mrec = new MediaRecorder(); // Works well
        mCamera.unlock();

        mrec.setCamera(mCamera);

        mrec.setPreviewDisplay(surfaceHolder.getSurface());
        mrec.setVideoSource(MediaRecorder.VideoSource.CAMERA);
        mrec.setAudioSource(MediaRecorder.AudioSource.MIC);

        mrec.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH));
        mrec.setPreviewDisplay(surfaceHolder.getSurface());
        mrec.setOutputFile("/sdcard/zzzz.3gp");

        mrec.prepare();
        mrec.start();
    }


    protected void stopRecording() {
        mrec.stop();
        mrec.release();
        mCamera.release();
    }


    private void releaseMediaRecorder() {
        if (mrec != null) {
            mrec.reset(); // clear recorder configuration
            mrec.release(); // release the recorder object
            mrec = null;
            mCamera.lock(); // lock camera for later use
        }
    }


    private void releaseCamera() {
        if (mCamera != null) {
            mCamera.release(); // release the camera for other applications
            mCamera = null;
        }
    }


    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width,
                               int height) {}


    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        if (mCamera != null) {
            Parameters params = mCamera.getParameters();
            mCamera.setParameters(params);
        }
        else {
            Toast.makeText(getApplicationContext(), "Camera not available!", Toast.LENGTH_LONG).show();
            finish();
        }
    }


    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        mCamera.stopPreview();
        mCamera.release();
    }
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="Kazemi.Sam.course.app.my_spy_camera_test"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="8" />

    <uses-permission android:name="android.permission.CAMERA" />

    <uses-feature android:name="android.hardware.camera" />

    <uses-permission android:name="android.permission.RECORD_AUDIO" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

    <application
        android:icon="@drawable/cameraicon2"
        android:label="@string/app_name" >
        <activity
            android:name=".My_Camera_Helper"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".MyspycameratestActivity"
            android:label="@string/app_name" >
        </activity>
    </application>

</manifest>

<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" >

    <RelativeLayout
        
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical" >

        <SurfaceView
            android:id="@+id/surface_camera"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1" />

        <Button
            android:id="@+id/buttonstart"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="@drawable/record_start" />
    </RelativeLayout>

</LinearLayout>