scoreboard rank display not showing

[Jaghahz]

the script 

every 1 seconds:
    loop all players:
        wipe loop-player's sidebar
        set name of sidebar of loop-player to "&cServerName"
        set score "&m---------------" in sidebar of loop-player to 5
        set score "&cName: &3%loop-player's name%" in sidebar of loop-player to 4
        set score "&cRank: &3%loop-player's prefix%" in sidebar of loop-player to 3
        set score "&cKills: &3%{kills.%loop-player%}%" in sidebar of loop-player to 2
        set score "&cDeaths: &3%{deaths.%loop-player%}%" in sidebar of loop-player to 1

on death:
  add 1 to {kills.%attacker%}
  add 1 to {killstreak.%attacker%}
  add 1 to {deaths.%victim%}
  set {killstreak.%victim%} to 0

on first join:
  set {kills.%player%} to 0
  set {killstreak.%player%} to 0
  set {deaths.%player%} to 0
  set {killstreak.%player%} to 0