/etc/exports [1]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/share".#012 Assuming default behaviour ('no_subtree_check').#012 NOTE: this default has changed since nfs-utils version 1.0.x

NIS Server Error

Just add the option subtree_check to /etc/exports like this:

/storage 172.16.20.1/24(rw,sync,no_root_squash,subtree_check)