Please help, how do i fix this error

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// Define input parameters from the original code
input double LotSize = 0.1;
input int FastMA = 10;
input int SlowMA = 20;

// Define the CTrade class with strategic trading moves
class CTrade {
public:
    void Buy(double lotSize, string symbol, double price, double stopLoss, double takeProfit, string comment) {
        double profit = lotSize * (takeProfit - price); // Calculate profit
        Print("Buy trade opened at price: ", price, " Profit: ", profit);
    }

    void Sell(double lotSize, string symbol, double price, double stopLoss, double takeProfit, string comment) {
        double profit = lotSize * (price - takeProfit); // Calculate profit
        Print("Sell trade opened at price: ", price, " Profit: ", profit);
    }
};

// Define the Expert base class and derived class with Moving Average strategy
class CExpertImplementation {
public:
    CTrade trade;
    double fastMA, slowMA;
    double ask, askStopLevel, bid, bidStopLevel;

    CExpertImplementation() {
        fastMA = iMA(_Symbol, 0, FastMA, 0, MODE_SMA, PRICE_CLOSE);
        slowMA = iMA(_Symbol, 0, SlowMA, 0, MODE_SMA, PRICE_CLOSE);
    }

    void OnTick() {
        double currentFastMA = iMA(_Symbol, 0, FastMA, 0, MODE_SMA, PRICE_CLOSE);
        double currentSlowMA = iMA(_Symbol, 0, SlowMA, 0, MODE_SMA, PRICE_CLOSE);

        double stopLevel = 0.0;
        double currentStopLevel = 0.0;
        if (SymbolInfoDouble(_Symbol, SYMBOL_TRADE_STOPS_LEVEL, currentStopLevel)) {
            stopLevel = currentStopLevel;
            if (stopLevel != 0) {
                double currentBid, currentAsk;
                if (SymbolInfoDouble(_Symbol, SYMBOL_BID, currentBid) && SymbolInfoDouble(_Symbol, SYMBOL_ASK, currentAsk)) {
                    if (currentFastMA < currentSlowMA && fastMA >= slowMA) {
                        bid = currentBid;
                        trade.Sell(LotSize, _Symbol, bid, stopLevel, bid - 100 * _Point, "Sell Signal");
                    } else if (currentFastMA > currentSlowMA && fastMA <= slowMA) {
                        ask = currentAsk;
                        trade.Buy(LotSize, _Symbol, ask, stopLevel, ask + 100 * _Point, "Buy Signal");
                    }
                }
            }
        }

        fastMA = currentFastMA;
        slowMA = currentSlowMA;
    }

    void Deinit() {
        // Deinit logic here
    }
};

CExpertImplementation ExtExpert;

//+------------------------------------------------------------------+
//| Expert initialization function                                   |
//+------------------------------------------------------------------+
void OnTick() {
    ExtExpert.OnTick();
}

//+------------------------------------------------------------------+
//| Expert deinitialization function                                 |
//+------------------------------------------------------------------+
void OnDeinit(const int reason) {
    ExtExpert.Deinit();
}
  
    void OnTick() {
        double currentFastMA = iMA(_Symbol, 0, FastMA, 0, MODE_SMA, PRICE_CLOSE);
        double currentSlowMA = iMA(_Symbol, 0, SlowMA, 0, MODE_SMA, PRICE_CLOSE);

Perhaps you should read the manual, especially the examples.
   How To Ask Questions The Smart Way. (2004)
      How To Interpret Answers.
         RTFM and STFW: How To Tell You've Seriously Screwed Up.

They all (including iCustom) return a handle (an int). You get that in OnInit. In OnTick/OnCalculate (after the indicator has updated its buffers), you use the handle, shift and count to get the data.
          Technical Indicators - Reference on algorithmic/automated trading language for MetaTrader 5
          Timeseries and Indicators Access / CopyBuffer - Reference on algorithmic/automated trading language for MetaTrader 5
          How to start with MQL5 - General - MQL5 programming forum - Page 3 #22 (2020)
          How to start with MQL5 - MetaTrader 5 - General - MQL5 programming forum - Page 7 #61 (2020)
          MQL5 for Newbies: Guide to Using Technical Indicators in Expert Advisors - MQL5 Articles (2010)
          How to call indicators in MQL5 - MQL5 Articles (2010)

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