Why am I unable to delete contacts from my LG G4?

[AC Question]

Cannot delete contacts from my LG G4

Hi All,

When i try to delete a contact from my LG G4 contacts it is showing me the popup "Contact will be deleted from phone, but not from server.Delete?". When i click on delete the contact is still appearing on my contacts list.
Please help me out.

Thanks,
Harish