And please... pretty please, update the Web API samples to use the latest version of ASP.Net Identity. Thanks!

See... this is just one sample of undocument procedures. Extensibility of the client apps such as of those implemented for iOS, Android, Phone is nowhere to be found. Because these templates are tightly-coupled with the Crosslight binaries. In which part of the client framework are those controllers being consumed? In this instance, how would you modify the client app implementation to cater customizations such as these when you don't know where to start? Are we suppose to extend the AppFramework? It's like with Crosslight... just get the samples and you're on your own. I hope you can sense our frustration here. If you can guide us to the right path, then that would be nice.

If you looked at the error, I did mention the issue happens when closing the view. The error shows that it is an issue when using the NavigationService.Close() method. I have no problem running the sample as you have suggested neither do I have concerns when running our own code. The only issue is when using the Close() method. We used NavigationService because we had to close a modal master/detail context where the form view is loaded. This happens when clicking on Save and/or Done on the form view.

We've modified the sample file to replicate the error. We've added a functionality on "Update" button to launch a view on modal form. Click any item from the list, once on the Location detail view... a list of contacts should be in that form. Then click Done button (DO NOT click any item from the contacts list, it's not important), you should now receive the error.

Please use 4.0.5000.327