rpm database corrupted after fedeup from 20 to 21

[Mick]

Hi;
  I was running FC20 fully updated.
[root at localhost ~]#  fedup --network 21 --product=nonproduct

Which worked.
Now when I try to 'yum update'
[root at localhost ~]# yum update
error: rpmdb: BDB0641 __db_meta_setup: /var/lib/rpm/Packages: unexpected file type or format
error: cannot open Packages index using db5 - Invalid argument (22)
error: cannot open Packages database in /var/lib/rpm
CRITICAL:yum.main:

Error: rpmdb open failed
[root at localhost ~]# 

Or rpm--rebuilddb
[root at localhost ~]# rpm --rebuilddb
error: rpmdb: BDB0641 __db_meta_setup: /var/lib/rpm/Packages: unexpected file type or format
error: cannot open Packages index using db5 - Invalid argument (22)
[root at localhost ~]# 

Any ideas?
Apart from this the system is working fine.

MM