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hitTest Help!!

I have a MC named ball, and another one named wall. I am able to navigate the ball with the arrows. I also won’t it to stop when it touches the wall. What’s wrong with this code? ?

onEnterFrame=function()
{speed=5;
if (Key.isDown(Key.DOWN)) {ball._y+=speed;
}
{if (Key.isDown(Key.UP)) {ball._
y-=speed;
}
{if (Key.isDown(Key.RIGHT)) {ball._x+=speed;
}
{if (Key.isDown(Key.LEFT)) {ball._
x-=speed;
if (ball.hitTest(wall)==true) {
speed=0;
}

}
}
}
}

}

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