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/ 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。

スクリーンショット 2017-07-28 16.58.48.png

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