MT4 · Trade return codes
MT4 5 · Old version of the client terminal | YI GOLD
ERR_OLD_VERSION
Official meaning
Old version of the client terminal
Possible causes · YI GOLD suggestions
Determine the cause from the official meaning, the triggering function and terminal logs.
Troubleshooting · YI GOLD suggestions
Check permissions, sessions, symbol specifications, quotes and request parameters. Reproduce in a demo account. Do not retry rejected requests indefinitely.