MT4 · Runtime errors
MT4 4200 · Object already exists | YI GOLD
ERR_OBJECT_ALREADY_EXISTS
Official meaning
Object already exists
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.