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OrderSendAsync gives error 4756, retcode = 10013
I get the error: 2019.01.02 23:58:00 PlaceOrder: error 4756, retcode = 10013 4756 : Trade request sending failed 10013: Invalid request Anyone an idea why this fails?? MqlTradeRequest req={ 0 }; req.action = TRADE_ACTION_SLTP ; req.symbol = _Symbol ; req.magic = MagicNumber;