D9805: Show error message to the user

[Albert Astals Cid]

aacid added a comment.


  I just realzied this is not how you use QMEsasgebox critical.
  
  Since it's static you just do QMessageBox::critical(...)
  
  Second one should be Prefs::background and not Prefs::tileSet?

REVISION DETAIL
  https://phabricator.kde.org/D9805

To: schwarzer, #kde_games
Cc: aacid
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