Strange error when software updates are available

For the past two weeks or so, each time there is an update, I get a popup at the bottom, please see screenshot image attached.

I am using KDE Neon Plasma 5.20.3

It says, just in case you don't manage to read it:

E: The repository 'http://ppa.launchpad.net/clipgrab-team/ppa/ubuntu focal release' does not have a release file

W: See apt-secure(8) manpage for repository creation and user configuration

I have no idea what should I do with that?

Thanks
Alex
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