Error in GNOME Software - While fetching https://sdk.gnome.org/repo/summary.idx: [6] Could not resolve hostname

I get this error message in the GNOME Software Centre:

While fetching https://sdk.gnome.org/repo/summary.idx: [6] Could not resolve hostname

The host can indeed not be resolved. How can I get rid of this message? Does it come from an old repo configuration?

The file located at https://sdk.gnome.org/repo/summary.idx served as a metadata index for the GNOME Flatpak repository. Currently, Flathub serves as the central repository for Flatpak applications and runtimes, including those provided by GNOME.

please show us

flatpak remotes

Thanks Flo!

$ flatpak remotes -d
Name    Title                 URL                                    Collection ID Subset Filter Priority Options    Comment Description Homepage Icon
fedora  Fedora                oci+https://registry.fedoraproject.org -             -      -      1        system,oci -       -           -        -
flathub Flathub               https://dl.flathub.org/repo/           -             -      -      1        system     -       -           -        -
gnome   Gnome Stable Runtimes https://sdk.gnome.org/repo/            -             -      -      1        system     -       -           -        -

After this I did:
flatpak remote-delete gnome
And the error message disappeared.

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