libsmi error row-node-subidentifier-one

Error text: subidentifier of row node `__' must be 1

Reference: RFC 2579 section 7.10

(1)  If the object corresponds to a conceptual table, then only a single
     assignment, that for a conceptual row, is present immediately
     beneath that object.  The administratively assigned name for the
     conceptual row object is derived by appending a sub-identifier of
     "1" to the administratively assigned name for the conceptual table.