I need help with this scoreboard kill/death counter

[Ekical]

Hello i'm trying to make a scorebaord that has a kill/death counter and it says it doesn't understand this condition/effect what do i do?

Code:
on join:
while player is online:
wipe player's sidebar
set name of sidebar of player to "*im not telling you the name of my server*"
set score " " in sidebar of player to 11
set score " &a&l&oINFO" in sidebar of player to 10
set score "&fName&7: &7%player%" in sidebar of player to 9
set score "&fRank&7: %player's prefix%" in sidebar of player to 8
set score "&fYour Balance&7: &7%player's balance%" in sidebar of player to 7
set score "&fKills&7: "%{kills.%player%}% in sidebar of player to 6
set score "&fDeaths&7: "%{deaths.%player%}% in sidebar of player to 5
wait a second
[doublepost=1612083603,1612062305][/doublepost]update: nvm i found out how to

 

[TehCheetah]

Realistically, you wouldn't really need skript to set up a scoreboard!