Did you ever figure this out? I have a Cisco 891 router that has been working for a while and all of the sudden I am having the same error you are reporting here. I've rebooted the router and reconfigured SNMP, etc.. but cant get it to read.
Here is the result of my Walk test and Uptime test
Paessler SNMP Tester 5.1.3
4/7/2015 9:57:43 AM (1 ms) : Device: 68.115.133.162
4/7/2015 9:57:43 AM (1 ms) : SNMP V2c
4/7/2015 9:57:43 AM (2 ms) : Walk
4/7/2015 9:57:43 AM (4 ms) : Error: -2007
----------------------- New Test -----------------------
Paessler SNMP Tester 5.1.3
4/7/2015 9:58:10 AM (1 ms) : Device: 68.115.133.162
4/7/2015 9:58:10 AM (2 ms) : SNMP V2c
4/7/2015 9:58:10 AM (3 ms) : Uptime
4/7/2015 9:58:10 AM (89 ms) : -------
4/7/2015 9:58:10 AM (90 ms) : DISMAN-EVENT-MIB::sysUpTimeInstance = No such object (SNMP error # 222) ( 0 seconds )
4/7/2015 9:58:10 AM (176 ms) : HOST-RESOURCES-MIB::hrSystemUptime.0 = No such object (SNMP error # 222) ( 0 seconds )
4/7/2015 9:58:10 AM (177 ms) : Done
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