https://i.gyazo.com/5b54dfb54ef1a38a200e706b09704a37.png

plugin doesnt appear to be working, only other plugin on the server is https://github.com/funniray/EssentialsNK which should format the chat. (error occurs even without essentialsnk)

according to dev of nukkitx you are trying to inject into a final field (or something like that)

Issue was because Nukkit uses a Set, not a list.

Thanks for reporting :)