MT4 · Runtime errors
MT4 150 · An attempt to close an order contravening the FIFO rule | YI GOLD
ERR_TRADE_PROHIBITED_BY_FIFO
Official meaning
An attempt to close an order contravening the FIFO rule
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.