Quantower - Alpaca issue sending orders

I have a problem when I send orders from Quantower to Alapaca… The connection between them is ok, as I see the Account info, and the symbols data…

The problem is that when I send an order to alpaca through a strategy, appears the following error: " Failure. Incorrect request parameters".
But the order is sent anyway!!

Do you know what could be?, Which are the correct parameters? I put: " Core.Instance.PlaceOrder(this.symbol, this.account, Side.Buy, TimeInForce.Day, 1000);"

The problem is that if I want to check if the position is there in the strategy, It cannot detect and I cannot close the position…