Android : Unable to start activity componentInfo on eclipse

I am currently having a problem with my java code. I app is crashing each time i click on my view button. On my logcat I am getting an error message which is Caused by: java.lang.NullPointerException and the other error is java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.moviemanager/com.example.moviemanager.viewmoviedetails}: java.lang.NullPointerException

This is my viewmoviedetails code:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.viewmoviedetail);

    keyEditText = (EditText)findViewById(R.id.keyeditText);
    titleEditText = (EditText)findViewById(R.id.titleeditText);
    typeEditText = (EditText)findViewById(R.id.typeeditText);
    storyEditText = (EditText)findViewById(R.id.storyeditText);
    ratingEditText = (EditText)findViewById(R.id.ratingeditText);
    languageEditText = (EditText)findViewById(R.id.languageeditText);
    runtimeEditText = (EditText)findViewById(R.id.runtimeeditText);

    Bundle extras = getIntent().getExtras();
    rowID = extras.getLong("row_id");

    Button btnback = (Button)findViewById(R.id.backbutton);
    btnback.setOnClickListener(backButtonClicked);
}
OnClickListener backButtonClicked = new OnClickListener(){
    @Override
    public void onClick(View v){
        finish();
    }
};
@Override
protected void onResume(){
    super.onResume();
    new LoadMovieTask().execute(rowID);
}

private class LoadMovieTask extends AsyncTask<Long, Object, Cursor>{
    DatabaseHandler dh = new DatabaseHandler(viewmoviedetails.this);

    @Override
    protected Cursor doInBackground(Long... params){
        dh.open();
        return dh.getRow(params[0]);
    }

    @Override
    protected void onPostExecute(Cursor result){
        super.onPostExecute(result);
        result.moveToFirst();
        int keyindex = result.getColumnIndex("mvkey");
        int titleindex = result.getColumnIndex("mvtitle");
        int typeindex = result.getColumnIndex("mvtype");
        int storyindex = result.getColumnIndex("mvstory");
        int ratingindex = result.getColumnIndex("mvrating");
        int languageindex = result.getColumnIndex("mvlanguage");
        int runtimeindex = result.getColumnIndex("mvruntime");

        keyEditText.setText(result.getString(keyindex));
        titleEditText.setText(result.getString(titleindex));
        typeEditText.setText(result.getString(typeindex));
        storyEditText.setText(result.getString(storyindex));
        ratingEditText.setText(result.getString(ratingindex));
        languageEditText.setText(result.getString(languageindex));
        runtimeEditText.setText(result.getString(runtimeindex));

        result.close();
        dh.close();
    }
}

Can someone help me to solve my error. Thanks in advance