MT4 · Runtime errors
MT4 4106 · Unknown symbol | YI GOLD
ERR_UNKNOWN_SYMBOL
Official meaning
Unknown symbol
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.