Jackinafool14950

Hey! I got to install the screenpack but unfortunately, I get this error screen: 
.\external\script\start.lua:1403: chars/kfmZ/kfmZ.def:
./data/ilx/action.zss
data/ilx/action.zss:10:
Undefined function: iksys_firstattack
stack traceback:
    [G]: in function 'game'
    .\external\script\start.lua:1403: in function 'f_game'
    .\external\script\start.lua:1839: in function 'launchFight'
    external/script/default.lua:20: in function <external/script/default.lua:0>
    .\external\script\start.lua:1457: in function 'f'
    external/script/main.lua:3105: in function 'loop'
    external/script/main.lua:3189: in function 'loop'
    external/script/main.lua:4156: in main chunk
    [G]: ?
I don't know how to fix it and would welcome any help because I wanna enjoy this great screenpack.