Contact synch error

I have both a ‘Friends’ contact group and a ‘friends’ contact group. The duplicate name is apparently a problem that results in a synch error message. I cannot delete either group, even if there are no contacts in the group. Stupid error on my part, but is there a way to delete the lower case group? I tried repairing the database but this did not resolve the problem.

The synch error message is:

[Google Contacts] Creating or updating folder ‘’ failed due to the following error: Cannot modify a system group.