libsmi error oid-registered

Error text: identifier `__' registers OID already registered as identifier `__'

Reference: RFC 2578 section 3.6

(1)  registration: the definition of a particular item is registered as
     a particular OBJECT IDENTIFIER value, and associated with a
     particular descriptor.  After such a registration, the semantics
     thereby associated with the value are not allowed to change, the
     OBJECT IDENTIFIER can not be used for any other registration, and
     the descriptor can not be changed nor associated with any other
     registration.