Skill realization: summon a monster

Code:  
Client script: 
local function MonsterspawnRequests(mosterId)
  PackageHandlers.sendClientHandler("MonsteSpawn",{mosterId}, function()
      print("A monster build request has been sent")
  end)
end

summonBar.Moster_1.onMouseClick = function(instance, window) 
  if(gold>=monstersButtons[1].cost) then 
    gold=gold-monstersButtons[1].cost 
    goldText:setText("Gold："..gold) 
    MonsterspawnRequests(monstersButtons[1].id)
  end
  
end

Server-side script:
PackageHandlers.registerServerHandler("MonsteSpawn", function(player, parameter)
    local mosterId=parameter[1] 
    print("Request accepted and monster generated:",parameter[1])
    local pos
    if(player:getRebirthPos().x>0) then
      pos = Lib.v3(math.random(-5,-2),0,math.random(-10,10))+player:getRebirthPos() 
    else
     pos = Lib.v3(math.random(2,5),0,math.random(-10,10))+player:getRebirthPos()  
   end
    local entity= player:createPet(mosterId, true, player.map, pos) 
 end)