"I've modified some reason in the contact conversation and I'm not able to save it. I've modified some fields in the contact info and I'm trying to save it but I'm getting an error"

"I've modified some reason in the contact conversation and I'm not able to save it. I've modified some fields in the contact info and I'm trying to save it but I'm getting an error"

 

System doesn't allow adding a duplicate contact. Name and email id, Name and Phone number. These combinations must not be the same in 2 or more contacts