PackageKit can’t find file in /var/cache/PackageKit/

After installing RPM Fusion repos on Fedora 28 you might be getting an error shown by update manager every few minutes in GUI.
Error will say something like this: “Error when getting information for file “/var/cache/PackageKit/28/metadata/rpmfusion-nonfree-nvidia-driver/repodata/appstream.xml.gz”: No such file or directory

Error is described here https://bugzilla.redhat.com/show_bug.cgi?id=1580162 and seem to be caused by a repo that claims to support appdata but doesn’t actually provide it.

Error can be resolved by changing enabled_metadata=1 to enabled_metadata=0 in repo description file.
In case of above error change was made in /etc/yum.repos.d/rpmfusion-nonfree.repo and it now looks like this:

[rpmfusion-nonfree]
name=RPM Fusion for Fedora $releasever - Nonfree
#baseurl=http://download1.rpmfusion.org/nonfree/fedora/releases/$releasever/Everything/$basearch/os/
metalink=https://mirrors.rpmfusion.org/metalink?repo=nonfree-fedora-$releasever&arch=$basearch
enabled=1
enabled_metadata=0 #changed from 1 to 0
metadata_expire=14d
type=rpm-md
gpgcheck=1
repo_gpgcheck=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-rpmfusion-nonfree-fedora-$releasever

[rpmfusion-nonfree-debuginfo]
name=RPM Fusion for Fedora $releasever - Nonfree - Debug
#baseurl=http://download1.rpmfusion.org/nonfree/fedora/releases/$releasever/Everything/$basearch/debug/
metalink=https://mirrors.rpmfusion.org/metalink?repo=nonfree-fedora-debug-$releasever&arch=$basearch
enabled=0
metadata_expire=7d
type=rpm-md
gpgcheck=1
repo_gpgcheck=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-rpmfusion-nonfree-fedora-$releasever

[rpmfusion-nonfree-source]
name=RPM Fusion for Fedora $releasever - Nonfree - Source
#baseurl=http://download1.rpmfusion.org/nonfree/fedora/releases/$releasever/Everything/source/SRPMS/
metalink=https://mirrors.rpmfusion.org/metalink?repo=nonfree-fedora-source-$releasever&arch=$basearch
enabled=0
metadata_expire=7d
type=rpm-md
gpgcheck=1
repo_gpgcheck=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-rpmfusion-nonfree-fedora-$releasever

After the change is made run pkcon repair and then pkcon update to check for any errors.

[root@laptop ~]# pkcon repair
                              [=========================]         
Finished                      [=========================]         
                              [=========================]         
Finished                      [=========================]         
[root@laptop ~]# pkcon update
Getting updates               [=========================]         
Finished                      [=========================]         
No packages require updating to newer versions.
[root@laptop ~]#