"The Application "Sonarr" can't be opened." (I've read other threads)

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On OS X, this worked for me…

Sonarr doesn't start, and deleting logs.db file no longer fixes it

I’ve had Sonarr end up in the “Epic Fail” state twice in the past month. Not sure why this is a problem recently whereas it ran great for months before. As mentioned earlier, the logs.db file seems to be the culprit. on OS X: cd /Users/$USER/.config/NzbDrone mv logs.db logs.db.old