yum update stop working in f18

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http://forums.fedoraforum.org – I did yum update after use LiveUSB to ge f18 installed. but from yesterday, I got this, and update stopped Remove 2 Packages Total size: 45 M Is this ok [y/N]: y Downloading Packages: warning: /var/cache/yum/x86_64/18/rpmfusion-nonfree-updates/packages/rpmfusion-nonfree-release-18-3.noarch.rpm: Header V3 RSA/SHA256 Signature, key ID e31b30ca: NOKEY Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-rpmfusion-nonfree-fedora-18-x86_64 GPG key retrieval failed: [Errno 14] Could not open/read file:///etc/pki/rpm-gpg/RPM-GPG-KEY-rpmfusion-nonfree-fedora-18-x86_64 what is wr (HowTos)