You have several databases listed under your Profile (known databases section). www.comicbase.com/mycb/profile.aspx
Because you have so many, i wonder if you had the wrong database loaded into the app when you scanned your comics; when you went to sync in the CB software on your computer you may have a totally different database loaded in (different from the app) thus producing the error.
Would recommend you visit your online profile (www.comicbase.com/mycb/profile.aspx ) and make sure the right the database is listed; 'remove' any database you don't use from known databases list. The database you end up going with must be the same in the app and CB software.
If you're wondering what the name of your database is, it'll be noted in the CB software - just glance at the header bar of the software window, it'll be noted in Parentheses