Appears you do not have the CISCO-TAP2-MIB loaded on the NMS. You can either load this mib along with all the dependancies, or call the oid out by numeric oid.
If you do not want to load the mib try:
snmpwalk -v3 -u liuser -a MD5 -A password -l authNoPriv 192.168.111.1 1.3.6.1.4.1.9.9.399.1.2.1.1.3