After adding this to the info.plist of the Watchkit app:
<key>NSAppTransportSecurity</key>
<dict>
<key>NSAllowsArbitraryLoads</key>
<true/>
</dict>
I get the folloging when trying to get it to run on the simulator.
The operation couldn’t be completed. (LaunchServicesError error 0.)
I cleaned the build, reset all simulators and emptied the "Derived Build" folder. No avail.