The Last Address Book Operation Did not Succeed due to a Server error (Error code: -40402)

I am not using Yahoo Messenger (YM) very often but at least keep a relation with my old Yahoo chat contacts most are from my college days. This time I ended up with a failure message while trying to delete an old chat contact to update his new chat ID. The error message I received while trying to delete Yahoo messenger contact is "The last address book operation did not succeed due to a server error (error code: -40402)". I tried to log out and login to check whether the contact was deleted from the address list. It was still there and the delete operation I did is a failure.


Reasons for Code 40402

In support forums many users say error 40402 occurs when you attempt to delete a contact, which had been added in yahoo email, from messenger. Another reason for "The last address book operation did not succeed due to a server error (error code: -40402) " is actually that address already deleted but some how shown in messenger contact list. So when you attempt to delete a contact from YM which is actually not present, you will get this failure code. Another reason found from their support blog is when they are doing maintenance or upgrading server, users will receive the same message.

The Last Address Book Operation Did not Succeed due to a server(code: -40402)

So the possible reasons are:
  1. Address is already deleted from address book and waiting for server synchronization

  2. Yahoo team doing maintenance on their server

  3. Contact is added by yahoo email instead from YM

Solution for Error code 40402

They suggest, try to delete the user from the yahoo mail first. Then come back to messenger and do the same. If the issue persists the possible reason is the server maintenance process. So it is better you wait for a reasonable period of time and try to delete the address again. So I am listing you possible troubleshooting steps to fix this failure.
  1. Log off and log in back

  2. Log on to email and delete the ID

  3. Come back to YM and check whether the user is removed fully. If it is still there try to remove

  4. If all the three steps mentioned above failed, wait for a reasonable period of time (say 3 hours)

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