Validation error in create duplicate user seems to be working fine where as the same in group doesn't display anything or insufficient information
1. create a user "testuser"
2. create another user with name "testuser"
you will get the correct Validation error (screenshots)
3. create a group "testgroup"
4. create another group with name "testgroup"
it displays invalid validation error (screenshots)
expected: duplicate group creation should work similar to duplicate group creation