I have left Microsoft and this blog is no longer under my control. All of the content should remain for some time however and any new updates can be found at http://davedev.net.
-Dave, September 2013
I ran across this today and wanted to share the fix. I have seen it crop up both XAML/C# and HTML/JS projects and has to do more with how the app is registered.
The error appears when you attempt to debug your Windows 8 metro Style App you will be prompted with a dialog informing you the application could not be started.
Clicking on Yes for more information will show you the id of the Metro Style App and point you to the Debug->Windows->Output window. Unfortunately looking in the Output window doesn’t give you much information either.
The goods news is the fix is simple! Simply exit out of Visual Studio 11 Beta and navigate to the solution file of your project. Once there delete everything inside of the bin folder.
Then open the project back up in Visual Studio 11 Beta and it should deploy correctly for debugging!
You may also want to check out my previous Windows 8 Metro Style Development Tips: