I am having the exact same issue - see attached screenshot. In the past this only ever happened if I had an issue with my internet connection, this is not the case here. The files are still added without problem, but this error continues to persist. I've spent several hours looking at forums and I've seen others with the same issue but no fix.
Running Windows 10, have restored settings to default, even done a fresh reinstall but issue persists.
Does the OP have a fix? Or does anyone else have any ideas? I would be grateful for any assistance.