Portupgrade failed - /var/db/pkg/pkgdb.db: unexpected file type or format

[Dominik Zalewski]

I'm using FreeBSD 6.1-stable . Today I updated my ports tree using cvsup and 
then I ran as usually portupgrade -a . It upgraded my portupgrade to version 
portupgrade-2.1.3.2,2. After that portupgrade stopped working.

Here is an error message:

[root at silicon /]# portupgrade -a
[Updating the pkgdb <format:bdb_btree> 
in /var/db/pkg ... /var/db/pkg/pkgdb.db: unexpected file type or format -- 
Invalid argument; rebuild needed] [Rebuilding the pkgdb <format:bdb_btree> 
in /var/db/pkg ... [Updating the pkgdb <format:bdb_btree> 
in /var/db/pkg ... /var/db/pkg/pkgdb.db: unexpected file type or format -- 
Invalid argument; rebuild needed] [Rebuilding the pkgdb <format:bdb_btree> 
in /var/db/pkg ... /var/db/pkg/pkgdb.db: unexpected file type or format -- 
Invalid argument: Cannot update the pkgdb!]: Cannot update the pkgdb!]
Command failed [exit code 1]: /usr/local/sbin/pkgdb -aFQ

Any ideas?

Thank you in advance,

     Dominik Zalewski