Vilnus, also check the minimum lot size from EURUSD at your broker, I had the same issue months ago and it turned out that the EA was trying to place a micro lot (0,01 lots) when the minimum lot size allowed by my broker was a mini lot (0.1 lots). You can check that by placing your self in the market watch -> in the symbol EURUSD -> right click -> specification -> scroll to the minimum lot size specification and compare to the lot size you are trying to place.