只要在线性布局上单击按钮，Android App就会崩溃

Question

我的代码：有人赢得游戏时将调用playAgain方法！

public void playAgain(View view) {

   LinearLayout layout = (LinearLayout)findViewById(R.id.playAgainLayout);
   layout.setVisibility(View.INVISIBLE);

        cur_game = 1;

        for (int i = 0; i < gamepos.length; i++) {
            gamepos[i] = 2;
        }

        GridLayout gridLayout = (GridLayout)findViewById(R.id.gridLayout);

        for (int i = 0; i < gridLayout.getChildCount(); i++) {
            ((ImageView)gridLayout.getChildAt(i)).setImageResource(0);
        }

}

这是错误：