MT5 · Compilation errors
MT5 251 · Structure declaration in the list of parameter is not allowed | YI GOLD
Official meaning
Structure declaration in the list of parameter is not allowed
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.