The mod works perfectly fine when tested in singleplayer, but as soon as I make a skeleton on my server I get disconnected with the message "A fatal error has occurred, this connection is terminated." In the console, it just says I disconnect. The client's logs, however, are spammed with this: https://pastebin.com/xRyu3vKD
After this happens, the player cannot rejoin without disconnecting instantly.

I deleted and reinstalled guideapi and it works fine now.