Oracle Message ORA-02306 - cannot create a type that already has valid dependent(s)

ERRORcannot create a type that already has valid dependent(s)
CAUSEAn attempt was made to create a type that already has some valid dependent(s) (these dependents depend on the fact that the type does not exist).
ACTIONDrop the dependents first before creating the type, or do not create the type.