What is server error code 40402?

Yahoo messenger error

the problem i have is that when i try to edit someone's contact info i get this error : The last address book operation did not succeed due to a sever error. (error code:-40402). i tried to delete the cache, add a reg string of the server, clean the...

I right click on name, click on delete, it asks if I am sure, I click yes, a window pops up saying, "the last address book operation did not suceed do to a server error.(Error Code:-40402). Can not delete contacts from yahoo messenger! WHY???

For two days I receive this whenever I try to add/change information in my list of contacts. I have re-installed. Did not help. I have "removed," rebooted, and re-installed--still the same problem. This has lasted for almost three days now...

Why does Yahoo tell me this when I try to edit my contact details? I know how to edit them, I've done it a million times, but now when I try to edit the details it says what I told you above. I don't understand. Any advice?

I clicked on the person name from button two, And then I click delete from button one. And I get this error notification. How do I remove this persons name?

Is anyone know of a fix for this...its been going on for the past 72 hours now..