MT4 / MT5 Error Codes & Trading Tools

Inspect terminal logs and the failing function return value. Check inputs, array bounds, resources, connectivity and required permissions against the official description.

Check permitted terminal sandbox paths, names, access flags, formats and handles. Record open failures without granting permissive directory access.

Inspect terminal logs and the failing function return value. Check inputs, array bounds, resources, connectivity and required permissions against the official description.

Compare each argument and reference mode with the official signature. Validate ranges and preserve relevant failure context.

Inspect terminal logs and the failing function return value. Check inputs, array bounds, resources, connectivity and required permissions against the official description.

Serialize account requests, verify previous outcomes, reduce frequency and use bounded backoff.

Inspect terminal logs and the failing function return value. Check inputs, array bounds, resources, connectivity and required permissions against the official description.

Inspect terminal logs and the failing function return value. Check inputs, array bounds, resources, connectivity and required permissions against the official description.

Check permitted terminal sandbox paths, names, access flags, formats and handles. Record open failures without granting permissive directory access.

Inspect connectivity, logs and request time. Verify actual order status before bounded retries with backoff to avoid duplicate exposure after a timeout.

Inspect terminal logs and the failing function return value. Check inputs, array bounds, resources, connectivity and required permissions against the official description.

Reduce recursion and large local arrays, review allocation/release, batch history processing and check memory-operation results.

Check length, bounds, dynamic-array declarations and ArraySetAsSeries. Validate returned element counts before access.

Verify symbol, timeframe, indicator handle, BarsCalculated and copied element counts. Wait for data availability rather than filling missing prices with zeros.

Inspect terminal logs and the failing function return value. Check inputs, array bounds, resources, connectivity and required permissions against the official description.

Inspect terminal logs and the failing function return value. Check inputs, array bounds, resources, connectivity and required permissions against the official description.

Check server time, gold trading sessions, holidays and terminal/EA permissions. Wait for availability instead of repeatedly retrying closed-market requests.

Inspect terminal logs and the failing function return value. Check inputs, array bounds, resources, connectivity and required permissions against the official description.

Inspect terminal logs and the failing function return value. Check inputs, array bounds, resources, connectivity and required permissions against the official description.

Inspect terminal logs and the failing function return value. Check inputs, array bounds, resources, connectivity and required permissions against the official description.

Inspect terminal logs and the failing function return value. Check inputs, array bounds, resources, connectivity and required permissions against the official description.

Check actual account denomination, free margin, volume and leverage. Calculate margin in the terminal and assess reduced exposure or genuine funding. Do not repeatedly submit the same request.

Verify symbol, timeframe, indicator handle, BarsCalculated and copied element counts. Wait for data availability rather than filling missing prices with zeros.

Verify symbol, timeframe, indicator handle, BarsCalculated and copied element counts. Wait for data availability rather than filling missing prices with zeros.

Reduce recursion and large local arrays, review allocation/release, batch history processing and check memory-operation results.

Verify symbol, timeframe, indicator handle, BarsCalculated and copied element counts. Wait for data availability rather than filling missing prices with zeros.

Verify symbol, timeframe, indicator handle, BarsCalculated and copied element counts. Wait for data availability rather than filling missing prices with zeros.

Verify symbol, timeframe, indicator handle, BarsCalculated and copied element counts. Wait for data availability rather than filling missing prices with zeros.

Verify symbol, timeframe, indicator handle, BarsCalculated and copied element counts. Wait for data availability rather than filling missing prices with zeros.

Verify symbol, timeframe, indicator handle, BarsCalculated and copied element counts. Wait for data availability rather than filling missing prices with zeros.

Verify symbol, timeframe, indicator handle, BarsCalculated and copied element counts. Wait for data availability rather than filling missing prices with zeros.

Check length, bounds, dynamic-array declarations and ArraySetAsSeries. Validate returned element counts before access.

Check length, bounds, dynamic-array declarations and ArraySetAsSeries. Validate returned element counts before access.

Check length, bounds, dynamic-array declarations and ArraySetAsSeries. Validate returned element counts before access.

Inspect terminal logs and the failing function return value. Check inputs, array bounds, resources, connectivity and required permissions against the official description.

Inspect terminal logs and the failing function return value. Check inputs, array bounds, resources, connectivity and required permissions against the official description.

Inspect terminal logs and the failing function return value. Check inputs, array bounds, resources, connectivity and required permissions against the official description.

Inspect terminal logs and the failing function return value. Check inputs, array bounds, resources, connectivity and required permissions against the official description.

Check permitted terminal sandbox paths, names, access flags, formats and handles. Record open failures without granting permissive directory access.

Check permitted terminal sandbox paths, names, access flags, formats and handles. Record open failures without granting permissive directory access.