You are trying to load an SNMPv2 MIB with the SNMP v1-only MIB loader.

You have three options.
(1) Use the native SNMPv1-v2 loader and browser which are not on the
Windows GUI menus.
      You load using loadmibv2 and your browse using browserv2 issued from
the command line.
(2) Use the web browser since you have already loaded the MIB with that.
(3) Go out to the Cisco website and download the SNMPv1 copy of the MIB and
load that with the same loader you got the error on.
      ftp://ftp.cisco.com/pub/mibs/v1

James Shanks
Level 3 Support  for Tivoli NetView for UNIX and Windows
Tivoli Software / IBM Software Group