Not Copying Level

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PHP Code:

function onActionServerSide()
{
  switch( params[0] )
  {
    case "Rpg_Start":

      echo("Setting Battle Up!");
      this.Fightlevel = params[2];
      this.TileT = params[5];
  copylevel("nerion_battle1.nw","battles/battle"@params[5]@"_"@params[1]@".nw");  
 
    }
} 


Can anybody tell me why this will not copy the level