为什么我在Objective-C中收到“消息发送到解除分配的实例”？

I have several buttons on my app that are being created dynamically. They are all pointed at the button click event when pressed. When the button pressed method is called, the sender's tag (int value) is parsed into the controller's house ID. It works with one of the buttons — the first one created, to be specific — but the others throw the following error: I have several buttons on my app that are being