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我试图在我创建的函数中返回一个向量的向量，但是我得到了“没有合适的用户定义转换”的错误。向量是类对象的向量。

/**function to get number of entries into an vector and pushback*/
std::vector<OrderBookEntry> AdvisorBot::EntryCount(std::string count,std::string tokens_string)
{
    //now use the tokenize func to get the string of each input
    std::vector<std::string> Tokens = CSVReader::tokenise(tokens_string, ',');

    std::string CountUserInput = count;
    int steps = std::stoi(CountUserInput);

    //pushback to entries vector of vectors
    std::vector< std::vector<OrderBookEntry> > Total_entries;

   
    for (int i = 0; i < steps; ++i) {
        if (i == 0) {
            Total_entries.push_back(AdvisorBot_orderBook.getOrders(OrderBookEntry::stringToOrderBookType(Tokens[1]), Tokens[0], currentTime));
        }
        else {
            currentTime = AdvisorBot_orderBook.getNextTime(currentTime);
            Total_entries.push_back(AdvisorBot_orderBook.getOrders(OrderBookEntry::stringToOrderBookType(Tokens[1]), Tokens[0], currentTime));
        }
    }
    //return std::vector<OrderBookEntry>();
    return Total_entries;

}

我只想返回我创建的向量Total Entries的向量。