Код ошибки 4756 mql5

Я выше привёл код, который находится в конце моей функции, которая открывает рыночные ордера:

  if (m_result.order < 1) {
    writeLog(MESSAGE_ERROR, __FUNCTION__ + " { position wasn't sent! " + "m_result.retcode = '" + iToS(m_result.retcode) + "' | " +
                                                                         "orderType = '" + EnumToString(m_request.type) + "' | " +
                                                                         "orderPrice = '" + dToS(m_request.price) + "' | " +
                                                                         "sl = '" + dToS(m_request.sl) + "' | " +
                                                                         "tp = '" + dToS(m_request.tp) + "' | " +
                                                                         "typeFilling = '" + (string)ENUM_ORDER_TYPE_FILLING(m_request.type_filling) + "' | " +
                                                                         "spread = '" + dToS(m_symbol.spread()) + "' }");
    if (_LastError > 0)    //---- Контролируем возможные ошибки
      writeLog(MESSAGE_ERROR, __FUNCTION__ + " { _LastError = '" + iToS(_LastError) + "' }");
    return false;
  }

Так вот после пачки ошибок:

Я вижу, что writeLog() принтует  в журнал следующее:

2020.12.16 23:42:40.742 2020.01.03 08:00:03   PositionsHandling::open { position wasn't sent! m_result.retcode = '10014' | orderType = 'ORDER_TYPE_SELL' | orderPrice = '1.11662' | sl = '1.12462' | tp = '1.07462' | typeFilling = '1' | spread = '0.00003' }
2020.12.16 23:42:40.742 2020.01.03 08:00:03   PositionsHandling::open { _LastError = '4756' }

Здесь видно, что в ходе отправки ордера произошла ошибка 4756 т.е. «Не удалось отправить торговый запрос«, а значение m_result.retcode = 10014 т.е. не правильный объём. Очевидно, что проблема в лоте. Как ещё это можно понимать?

Ещё нужно обратить внимание на значение typeFilling = 1, соответствующее перечислению (SYMBOL_FILLING_FOK)

Теперь, я ради эксперимента, непосредственно перед отправкой ордера присваиваю значение типа заливки ордера 2, соответствующее перечислению SYMBOL_FILLING_IOC. Делаю я это вот так:

  m_request.type_filling = SYMBOL_FILLING_IOC;

Вот что вернёт функция writeLog() после отправки ордера:

2020.12.16 23:54:50.920 2020.01.03 08:00:03   PositionsHandling::open { position wasn't sent! m_result.retcode = '10030' | orderType = 'ORDER_TYPE_SELL' | orderPrice = '1.11662' | sl = '1.12462' | tp = '1.07462' | typeFilling = '2' | spread = '0.00003' }
2020.12.16 23:54:50.920 2020.01.03 08:00:03   PositionsHandling::open { _LastError = '4756' }

Please refer to the updated Error Guide here:
https://docs.pineconnector.com/error

Here are some common issues faced by your other retail trader buddies. 

For MetaTrader Error Codes (130, 4756 etc), please click below to see more information.

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