Solved How do I make a currency debiting?

[TheDikey]

It is necessary that a certain currency is debited from PlayerCoin when buying. But it gives an error
code:

command /shop:
  Trigger:
    Set {_Inventory} to chest with 5 rows named "SHOP"
    Set slot 1 of {_Inventory} to diamond sword named "§a§lDIAMOND SWORD"
    Open {_Inventory} to executor

on inventory click:
  If name of event-inventory is "SHOP":
    cancel the event

    If clicked slot is 1:
      If PlayerCoin(executor) >= 19:
        Remove 19 from PlayerCoin(executor)
        Give player diamond sword named "DIAMOND SWORD"

errors:

PlayerCoin(the command sender) can't have anything removed from it (NeoMine\Main\Commands\GriefShop.sk, line 13: Remove 19 from PlayerCoin(executor)')

 

[Minecoll_YT]

PlayerCoin is a function and you cannot remove anything from it

 

[TheDikey]

and how else to do it?

PlayerCoin is a function and you cannot remove anything from it

 

[Minecoll_YT]

Remove it from the player coin variable?