Failed to syncronize cache 'i3lock-color' with copr

edit

I would install i3lock-color and I have see that it is on copr (link)

dnf copr enable watersalesman/i3lock-color
dnf install i3lock-color

And there is the result :

Failed to syncronize cache for repo 'watersealesman-i3lock-color', disabling.

I have tried to fix this by typing the following commands :

dnf clean all
dnf clean metadata
dnf upgrade

But without result...

There is the content of /etc/yum.repos.d/coprwatersalesman-i3lock-color.repo

[watersalesman-i3lock-color]
name=Copr repo for i3lock-color owned by watersalesman
baseurl=https://copr-be.cloud.fedoraproject.org/results/watersalesman/i3lock-color/fedora-$releasever-$basearch/
type=rpm-md
skip_if_unavailable=True
gpgcheck=1
gpgkey=https://copr-be.cloud.fedoraproject.org/results/watersalesman/i3lock-color/pubkey.gpg
repo_gpgcheck=0
enabled=1
enabled_metadata=1

Can you guys help me solving this issue ?

Thanks in advance.

Running under Fedora 28