A group must be shut down before it can be deleted.
Use the following CLI syntax to shut down and then delete a group.
config>router# rip
[no] group group-name
shutdown
config>router# rip
config>router>rip# group "RIP-ALA-3"
config>router>rip>group# shutdown
config>router>rip>group# exit
config>router>rip# no group "RIP-ALA-33"
Deleting the group without first shutting it down displays the following message.
INFO: RIP #1204 group should be administratively down - virtual router index 1,group
RIP-ALA-4