MT5 · Runtime errors
MT5 4003 · Wrong parameter when calling the system function | YI GOLD
ERR_INVALID_PARAMETER
Official meaning
Wrong parameter when calling the system function
Possible causes · YI GOLD suggestions
Parameter types, counts or ranges do not match the function signature.
Troubleshooting · YI GOLD suggestions
Compare each argument and reference mode with the official signature. Validate ranges and preserve relevant failure context.