I cannot add a contact to a group and I am showing duplicate groups with nohting in them and it won't allow me?

I cannot add a contact to a group and I have duplicate groups in my group list with no contacts in the list and when I try to delete the group with no contacts (which is a duplicate of another group) it wont let me gives me the following message Yahoo! Contacts
Something unexpected just happened. Please contact Yahoo Customer Care if the problem persists.
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Noah2014-05-26T13:26:52Z

Thank you for bringing this to our attention. I'm sorry to hear that you're having trouble removing duplicate contact lists. I have escalated the details of this issue to our engineering team for further investigation. We appreciate your patience as they look into the issue and work toward getting it resolved.