Forgot the pkg module

module etsi-nfv-pkg {

  yang-version 1.1;

  namespace "urn:etsi:nfv:yang:etsi-nfv-pkg";

  prefix pkg;

  import etsi-nfv-descriptors {

    prefix vnf;

  }

  organization

    "European Telecommunications Standards Institute (ETSI)";

  description

    "Network Function Virtualization Package.";

  revision 2019-03-18 {

    description

      "Initial revision.

       VNFD according to ETSI GS NFV-IFA 011 Ed261v254.";

  }

  container pkg {

    presence "Package container.";

    uses vnf:vnfd;

  }

}