Hi @JeZxLee,
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Is probably from kwallet. I don’t use it so I’m not sure. If you don’t want it, try disabling it.On second thought, it actually looks like a permissions problem/misconfiguration on a hard drive. Quite possibly an external hard drive. How and where is it mounted? See [Tutorial] Working with additional 'drives', [root tip] Use systemd to mount ANY device, and [root tip] systemd mount unit samples. - The notification is from matray. You can remove it or mute the notifications in System Settings.
Hope this helps!