function mutePlayer(player,command,name)
local playerToMute = getPlayerFromName(name)
setPlayerMuted(playerToMute,true)
outputChatBox ("You Have Been Muted",playerToMute,000,255,000)
end
addCommandHandler("mute",mutePlayer)
function unmutePlayer(player,command,name)
local playerToUnmute = getPlayerFromName(name)
setPlayerMuted (playerToUnmute, false)
outputChatBox("You Have Been UnMuted",playerToUnmute,255,000,000)
end
addCommandHandler("unmute",unmutePlayer)
next time have a closer look what arguments you're actually getting.