I installed this on Mac OS but the program always fails with:

  Uncaught Exception:
  Error: Could not get code signature for running application
      at m(/Applications/Youka.app/Contents/Resources/app/.webpack/main /index.js:1:12481)
    at App.<anonymous> (/Applications/Youka.app/Contents/Resources/app/.webpack/main/index.js:1:14365)
    at App.emit (events.js:215:7)