MT4 · Runtime errors
MT4 4109 · Trade is not allowed. Enable checkbox "Allow live trading" in the Expert Advisor properties | YI GOLD
ERR_TRADE_NOT_ALLOWED
Official meaning
Trade is not allowed. Enable checkbox "Allow live trading" in the Expert Advisor properties
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.