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he means downgrading mcmmo to 1.8, or upgrading spigot to 1.9
So how did you fix this? Then tell us
Maybe try updating the plugins or updating spigot
EDIT: You are stupid so you probably didn't even try this at first
no, but i know how it works, whats your server ip?
try removing that plugin
the latest version of essentials still works
try installing essentials and essentialschat to fix this
http://hastebin.com/socequtece.apache that's the fixed perworldplugins config
Has the custom plugin something to do with mcmmo? I think it is mcmmo-withdraw (i can't find it on internet, so that's probably the problem)
why don't you just use normal Essentials instead of EssentialsX
133 KB EssentialsGroupManager.jar
click on this to download the probably for you working version