error while installing vlc in Fedora 24

edit

I am getting the following error after adding repositories and running:

sudo dnf install vlc

The packages are downloaded but won't install, this error shows up:

warning: /var/cache/dnf/rpmfusion-free-updates=5975c4f892/packages/vlc-3.0.0.0.8.fc24.x86_64.rpm: header V4 RSA/SHA1 Signature, key ID b7546f06:NOKEY
Curl error (37): Couldn't read a file://file for file:///etc/pki/rpm-gpg/RPM-GPG-KEY-rpmfusion-free-fedora-24 [Couldn't open file /etc/pki/rpm-gpg/RPM-GPG-KEY-rpmfusion-free-fedora-24]