Script went wrong

2019-01-13: I was using v1.9.0.3.
After upgrading Minecraft, my script(2.mcaddon) doesn't work.(unexpectedPacket)

2019-01-14: I rewrite it, then it works again.(v0.0.1.mcaddon)
But I'm not about to add any new feature until anyone find a way to reduce the unbearable lag.