So you made your Watch app, needing a network call, you put the call in the Parent's app delegate handleWatchKitExtensionRequest. boom, you're getting error and cannot seem to debug the parent app. ANd here you are.

At first it looks as if you cannot debug a running Watchkit app and Parent app (both on simulator at the same time using XCode 6.3. But actually you could

Step 1

set a breakpoint on the line where you make the

WKInterfaceController.OpenParentApplication

and run the watchkit app

Step 2

As the execution is paused on the specified breakpoint, go to the iPhone simulator and manually launch the parent app.

Step 3

Go back to Xcode, head over to the menu bar and select Debug > Attach to Process > Your parent app . Press resume and you should be hitting the breakpoint on the parent app.

I really hope on XCode 6.4, they would just attach to the parent process automatically.