An error and a question

[tonibm19]

First the error:
with this code, when I execute a command, it says Unknow command and Player not found, but the code is executed, for my case it gives me the error I said, but mobs spawned.

Code:

function HandleApocalypseCommand( Split, Player )
       local HasSpawned = false;
       local KillPlayer = function(OtherPlayer)
           if (OtherPlayer:GetName() == Split[2]) then
               OtherPlayer:GetWorld():SpawnMob( OtherPlayer:GetPosX(), OtherPlayer:GetPosY(), OtherPlayer:GetPosZ(), 50 );
               OtherPlayer:GetWorld():SpawnMob( OtherPlayer:GetPosX(), OtherPlayer:GetPosY(), OtherPlayer:GetPosZ(), 50 );
               OtherPlayer:GetWorld():SpawnMob( OtherPlayer:GetPosX(), OtherPlayer:GetPosY(), OtherPlayer:GetPosZ(), 95 );
               OtherPlayer:GetWorld():SpawnMob( OtherPlayer:GetPosX(), OtherPlayer:GetPosY(), OtherPlayer:GetPosZ(), 95 );
               OtherPlayer:GetWorld():SpawnMob( OtherPlayer:GetPosX(), OtherPlayer:GetPosY(), OtherPlayer:GetPosZ(), 52 );
               OtherPlayer:GetWorld():SpawnMob( OtherPlayer:GetPosX(), OtherPlayer:GetPosY(), OtherPlayer:GetPosZ(), 52 );
               OtherPlayer:GetWorld():SpawnMob( OtherPlayer:GetPosX(), OtherPlayer:GetPosY(), OtherPlayer:GetPosZ(), 57 );
               OtherPlayer:GetWorld():SpawnMob( OtherPlayer:GetPosX(), OtherPlayer:GetPosY(), OtherPlayer:GetPosZ(), 51 );
               OtherPlayer:GetWorld():SpawnMob( OtherPlayer:GetPosX(), OtherPlayer:GetPosY(), OtherPlayer:GetPosZ(), 54 );
               HasSpawned = true;
           end
       end

       local dowithplayer = function(OtherPlayer)
          
       end
      
       cRoot:Get():FindAndDoWithPlayer(Split[2], KillPlayer);
       if (HasKilled) then
           Player:SendMessage( "You're causing the die of ..Split[2]..!");
       else
           Player:SendMessage( "Player not found" );
       end        
       if Split[2] == nil then
           Player:SendMessage( cChatColor.Green .. "Usage: /creeper [Player]" )
           return true
       end
end

Now the question:
Is there any way of set a player on fire?
I searched in API.txt and I con't find anything to to that.