Sponge plugins not working?

Hi, i installed the world edit plugin version 1.8.9 which is the same as my servers into the mods folder but everytime i try to connect to my server i get kicked with this message:

30.08 02:02:52 [Server] Netty Epoll Server IO #3/INFO [FML]: Rejecting connection CLIENT: [FMLMod:WorldEditCuiFe{1.0.2}]
30.08 02:02:52 [Disconnect] User darkblazeman has disconnected, reason: Mod rejections [FMLMod:WorldEditCuiFe{1.0.2}]
30.08 02:02:52 [Server] Server thread/INFO darkblazeman left the game

Anyone know why this is?

It looks like the version of the WorldEdit CUI your client is using isn’t compatible for some reason. Drop that and it should let you connect.