What's wrong with my code?

[NiLSPACE]

i think you have to change local OtherPlayer = OtherPlayer:GetName() to
local OtherPlayer = Split[2] since OtherPlayer is a nil value but i'm not sure.

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Maybe cRoot:Get():FindAndDoWithPlayer(Split[2], functionhere) works. like this:

local dowithplayer = function(OtherPlayer)
   OtherPlayer:TakeDamage(100, OtherPlayer)
end
if cRoot:Get():FindAndDoWithPlayer(Split[2], dowithplayer) == false then
    Player:SendMessage( "Player not found" )
else
    Player:SendMessage( "Player " .. Split[2] .. " is killed")
end

EDIT:
Not sure if it works though.