MT4 · Runtime errors
MT4 4201 · Unknown object property | YI GOLD
ERR_UNKNOWN_OBJECT_PROPERTY
Official meaning
Unknown object property
Possible causes · YI GOLD suggestions
Object names, types, properties, coordinates or chart subwindows do not match.
Troubleshooting · YI GOLD suggestions
Verify chart ID, object existence and property types. Check creation/update results and avoid name collisions.