It was my problem, but now I'm totally dissapointed with another thing. I tried to figure out how "MakePotion" works and now I have no idea what to do if I want to fix it.

What is happening: When I choose a potion to brew, clonk starts brewing, but then nothing happens.
Log:

WARNING: call to MakePotion gives 2 parameters, but only 1 are used (MenuCommand in MagicTimes.ocd\Potions.ocd\AlchemistKit.ocd\Script.c:0:0)

Code:
func ControlUse(object pClonk)
{
  pClonk->CreateMenu(GetID(), this, 1, "Nothing to craft", 0, 0, false);
  var i = 0, obj;
  while (obj = GetDefinition(i++))
  {
    if (!obj->~IsPotion()) continue;
    pClonk->AddMenuItem(Format("Brew a %s", obj->GetName()), "MakePotion", obj);
  }
  return true;
}

func MakePotion(ID)
{
  var pClonk = Contained();
  if (!pClonk) return;
  // remember components to be able to remove them later
  var components = [];
  // check if OK with GetComponents
  var i, ID, potion_ID;
  while (ID = GetComponent(nil, i++, nil, potion_ID))
  {
    var amount_needed = GetComponent(ID, nil, nil, potion_ID);
    var amount_available = pClonk->ContentsCount(potion_ID);
    if (amount_available < amount_needed)
    {
      Message("You need %d %s!", amount_needed, potion_ID->GetName());
      Sound("Error");
      return;
    }
    // add ID X times to the list
    while (amount_needed--)
    PushBack(components, ID); // PushBack adds something to the end of the list
    // everything is ok!
  }
  // remove components
  for (var comp in components)
  pClonk->FindContents(comp)->RemoveObject();
  // start timer to create potion
  var effect = AddEffect("BrewPotion",pClonk,100,4, nil, GetID());
  effect.potion = ID;
  return;
}

func FxBrewPotionTimer(target, effect, time)
{
  // effects...
  target->CreateParticle("MagicFlash",0,0,RandomX(-10,10),RandomX(-10,10),100, RGBa(255,155,0,200));
  if (time > 36*3) // three seconds
  {
  CreateObject(effect.potion);
  return -1;
  }
}

Also, effect will spawn object not in inventory, right?

Or writing like this is not necessary?
  {
  target->CreateContents(effect.potion);
  return -1;
  }

I'm sorry for asking big counts of questions >.<