Invalid volume

在 MTClientAPI.OrderClient.waitTransactionResult(OrderTransaction item)
在 MTClientAPI.OrderClient.executeRequest(Byte[] buf, Int32 tempID)
在 MTClientAPI.OrderClient.OrderSend(String symbol, Op operation, Double volume, Double price, Int32 slippage, Double stoploss, Double takeprofit, String comment, Int32 magic, DateTime expiration)
在 MT4APIGD.Zzh.CheckCanOrder(ZhdzhModel hl, ZhdzhModel gl, String symb, QuoteEventArgs cure1, QuoteEventArgs cure2, Int32