i added some kits, i saw my new kits in the /kit screen/add kit but i try a few mins ago click it then server kick me on the game, then when i write /kit i see some crash report and kicking  click and see pic

and this is the server cmd Drakee disconnecting: RPC Error in AddUI

yes i have the same problem the player writes to me when they select the kit so the kit slashes and kicks it out of the game. Where could the problem be?