Application failed to initialize - Sierra 10.12.6 (16G1510)

[jackyardfilament]

If I was having this issue, I would uninstall the app, reboot and then reinstall.

I use App Cleaner to uninstall unwanted or troublesome apps.

http://freemacsoft.net/appcleaner/

Also, did you download your copy of MakeMKV from this site?

Thanks for the link.