Need Help Trouble exporting Lightroom

[Elin.Emelie.V]

When I export pictures from Lightroom Classic i get files with no content. Can some one explain it to me? 
See the attached picture.
I got the same result in both the new and previous versions of Lightroom.

[JohanElzenga · Accepted solution]

Try resetting your preferences: https://www.lightroomqueen.com/how-do-i-reset-lightrooms-preferences/

[Elin.Emelie.V]

Thank you very much now it works!