MT4 · Runtime errors
MT4 4059 · Function is not allowed in testing mode | YI GOLD
ERR_FUNC_NOT_ALLOWED_IN_TESTING
Official meaning
Function is not allowed in testing mode
Possible causes · YI GOLD suggestions
Determine the cause from the official meaning, the triggering function and terminal logs.
Troubleshooting · YI GOLD suggestions
Inspect terminal logs and the failing function return value. Check inputs, array bounds, resources, connectivity and required permissions against the official description.