GPG key retrieval failed Errno 4 urlopen 2 pki

Error: GPG key retrieval failed Errno 4 urlopen 2 pki

While Upgrading from Fedora 11 to Fedora 12, I got the follwoing error message

warning: rpmts_HdrFromFdno: Header V3 RSA/SHA1 signature: NOKEY, key ID 57bbccba
fedora/gpgkey                                                                                                                                                                          
Importing GPG key 0x57BBCCBA "Fedora (12) " from /etc/pki/rpm-gpg/RPM-GPG-KEY-fedora
GPG key retrieval failed: [Errno 4] IOError:

Removed all the old rpms and headers from the yum cache in /var/cache/yum.
After cleaning the cache fedora upgradation started successfully
#yum clean all
#yum update -y



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