Trouble Changing Name of my Group #groupname


I read the Wiki on how to change the group name.    I am trying to add an "s" to my group name.. changing it from

"SoCalScout"  to "SoCalScouts" (plural).

when I change the email address and title of group then click Update on the bottom. I get an error message that says 

"Sorry But that Groups does Not Exist "

What does that mean? 

Why Can't I change the group name ?