Mib browser message

Hi,
I have just started to play with SNMP. When I am using SNMP Browser to check if SNMP working on my device I've got following response:
Request failed or timed out. Response PDU received from 10.243.176.65
Error Indication in response:
There is no such variable name in this mib.
Errindex: 1
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

I have copied all MIBs from that device but still has the same message. Could you please explain me in more detailes a message above. Thank you in advance.

Best Regards,
Ivo