ORA-21601: attribute is not an object

admin

ORA-21601: attributeis not an object
Cause: The user attempts to perform an operation (that isvalid only for an object)
to an attribute of a built-in type. An example of such an illegal operation isto
dynamically set a null structure to an attribute of a built-in type.
Action: Usershould avoid performing such operation to an attribute of built-in
type.