Could not add a SLA monitor

Could not add a SLA monitor

Hello,
I'm working with routers:
CISCO2951, IOS 2951-UNIVERSALK9_NPE-M), Version 15.1(3)T
CISCO3945, IOS C3900-UNIVERSALK9_NPE-M), Version 15.1(3)T
Couldn't add a SLA monitor,- the select list "source router" is empty!
SNMP is working fine, it retrieves router name and interfaces

I've the same setup with Cisco 871 12.4(24)T4, and can add SLA successfuly

I've configured them all with commands:
ip flow-cache timeout active 1
ip flow-export source Loopback0
ip flow-export version 5
ip flow-export destination 192.168.2.49 9996
ip flow-top-talkers
 top 20
 sort-by bytes
 cache-timeout 10000

snmp-server community cmonitor RW 5
access-list 5 permit 172.30.224.111


Best regards,
Vladimir

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