MT4 · Runtime errors
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
Inspect terminal logs and the failing function return value. Check inputs, array bounds, resources, connectivity and required permissions against the official description.