MT4 · Compiler warnings
MT4 70 · Invalid function return type or incorrect parameters during declaration of the event handler function | YI GOLD
Official meaning
Invalid function return type or incorrect parameters during declaration of the event handler 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.