prolem when i try to kill humans

[steve420]

hello everyone i have a problem i dunno if its on my end or its the server it self but...everytime i try to kill a human i would get an error saying invaild target:scratch: its a tbc server i would ask around on there forums but the server i play on is russian(the one with runwow) and i dont speak russian so that doesnt help heres a screen shot ANY help at all would be great