EA is not an expert and cannot be executed?

[fxbam]

When I try to add this EA to the chart I get a message same "is not an expert and cannot be executed".

Can someone shed some light on what is wrong here?

// Constants (Input Parameters)
input string EA_Name = "MR EA";
input double LotSize = 0.01; // Starting lot size
input double PipAmount = 10; // Minimum pip amount for trade entry
input int BuySellOption = 1; // 1 for buy, -1 for sell
input int StartHour = 8;     // Trading start hour
input int EndHour = 20;      // Trading end hour
input double TakeProfit = 50; // Take profit in pips
input double StopLoss = 30;   // Stop loss in pips
input double LotIncreasePercent = 0.25; // Lot size increase percent

// Global variables
int magicNumber = 12345; // Magic number for identification
int totalTradesThisMonth = 0;

void OnStart()
{
    // Check if it's within the specified trading hours
    int currentHour = Hour();
    if (currentHour < StartHour || currentHour >= EndHour)
        return;

    // Check for new closed candles
    double lastClosePrice = iClose(Symbol(), PERIOD_CURRENT, 1);
    double previousClosePrice = iClose(Symbol(), PERIOD_CURRENT, 2);
    double pipDifference = MathAbs(lastClosePrice - previousClosePrice) / Point;

    // Check if the closed candle has achieved the minimum pip amount
    if (pipDifference >= PipAmount)
    {
        // Determine the direction of the trade based on BuySellOption
        int tradeDirection = (BuySellOption == 1) ? OP_SELL : OP_BUY;
        double lotSize = LotSize + (AccountEquity() * LotIncreasePercent / 100.0);

        // Open the trade
        int ticket = OrderSend(Symbol(), tradeDirection, lotSize, Bid, 2, 0, 0, EA_Name, magicNumber, 0, clrNONE);
        if (ticket > 0)
        {
            // Order was placed successfully
            totalTradesThisMonth++;
            Print("Trade opened. Ticket: ", ticket);
        }
        else
        {
            Print("Failed to open trade. Error code: ", GetLastError());
        }
    }
}

int TradesThisMonth(int type)
{
    datetime firstDayOfMonth = iTime(Symbol(), PERIOD_MN1, 0);
    datetime trades[]; // Array to store trade times

    int total = 0;
    int tradeCount = OrdersHistoryTotal();
    for (int i = 0; i < tradeCount; i++)
    {
        if (OrderSelect(i, SELECT_BY_POS, MODE_HISTORY))
        {
            if (OrderType() == type && OrderOpenTime() >= firstDayOfMonth)
            {
                trades[total++] = OrderOpenTime();
            }
        }
    }
    return total;
}

bool OrderCloseAll()
{
    int totalOrders = OrdersTotal();
    bool closed = false;
    for (int i = totalOrders - 1; i >= 0; i--)
    {
        if (OrderSelect(i, SELECT_BY_POS, MODE_TRADES))
        {
            if (OrderSymbol() == Symbol() && OrderMagicNumber() == magicNumber)
            {
                if (OrderClose(OrderTicket(), OrderLots(), OrderClosePrice(), clrNONE))
                {
                    closed = true;
                    Print("Trade closed. Ticket: ", OrderTicket());
                }
                else
                {
                    Print("Failed to close trade. Error code: ", GetLastError());
                }
            }
        }
    }
    return closed;

[Carl Schreiber]

The function

void OnStart()

features either a script or a service. EA must have OnTick.

Maybe you should start with this:

    If you place the cursor on an MQL function and press F1, you will see the reference directly, many with examples to copy and paste - the fastest form to code.
    https://www.mql5.com/en/articles/496
    https://www.mql5.com/en/articles/100
    and for debugging: https://www.metatrader5.com/en/metaeditor/help/development/debug
    https://www.mql5.com/en/search#!keyword=cookbook
    "Bear in mind there's virtually nothing that hasn't already been programmed for MT4/MT5 and is ready for you - so searching gives better results than AI or ChatGPT!" (Carl Schreiber):
    => Search in the articles: https://www.mql5.com/en/articles
    => Search in the codebase: https://www.mql5.com/en/code
    => Search in general: https://www.mql5.com/en/search or via Google with: "site:mql5.com .." (forgives misspelling)