I can't sync with .mac!!!!

[lupineres]

Grettings,

I'm running OS 10.4.10 on a MacBook pro and have been having the following problem for a while. When i'm trying to sync my .mac account with my computer i get the following error:

.Mac Sync Error

*** -[NSKeyedUnarchiver initForReadingWithData:]: incomprehensible archive (0xffffff95, 0xffffffa7, 0x25, 0x54, 0x47, 0x47, 0x56, 0xffffff96)

I can't sync my contacts or address book (nothing happens) which is really annoying. I appreciate all the support support that you can give on the subject.

Rgds,
lupineres

[Giaguara]

Backup the items you want to sync (addressbook, bookmarks etc) manually.
Un-pair this mac from .mac sync, and add it again to be synced. This could repair the db corruption preventing it from happening.
If that does not do it, there are some next things to try here Upgradedb error after Leopard u/g (as the problem is something corrupted in the db)