MT4/MQL4 Technical Notes

Learn why Error 129 occurs in MT4 and how to fix invalid price errors by checking Bid, Ask, RefreshRates, NormalizeDouble, and pending order prices.

Learn why Error 130 occurs in MT4 and how to fix invalid stops by checking StopLevel, stop loss, take profit, pending orders, and broker rules.

Learn why Error 131 occurs in MT4 and how to check lot size, minimum lot, lot step, maximum lot, and broker settings.

Learn why Error 134 occurs in MT4 and how to fix not enough money errors by checking free margin, lot size, leverage, margin requirements, and account balance.

Learn how to use Quant Analyzer to analyze MT4 backtest reports, review hourly and monthly performance, sort trades, and find weaknesses in your EA.