Brizzda

I am having trouble adding any sit plugin to my server, especially the GSit plugin. Every time I try to add it it says an "Unkown Error Occurred." I looked in the console and this is what it said I am able to download plugins that don't involve sitting though: io/papermc/paper/event/player/AsyncChatDecorateEvent does not exist I'm not sure if anyone else is having a problem with this, but I need some help, please.