MT5 · Runtime errors
MT5 5043 · Unknown data type when converting to a string | YI GOLD
ERR_STRING_UNKNOWNTYPE
Official meaning
Unknown data type when converting to a string
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.