WatchKit Appで image not foundが出たら

WatchKit Appを実機デバッグしていて、起動時に下記のような image not found のエラーが出たら、

dyld: Library not loaded: @rpath/libswiftCore.dylib
  Referenced from: /private/var/containers/Bundle/Application/EEC67151-E7C1-4133-B50F-C709C1948A1F/watchkitapp.app/PlugIns/watchkitapp Extension.appex/watchkitapp Extension
  Reason: image not found

WatchKitAppの Build Settings > Build Options > Allways Embed Swift Standard Libraries を Yes にすると吉かもしれません。