We recently upgraded to the new Visual Studio and subsequently Windows Phone 8.1 preview. However when trying to deploy to the device or Windows Phone emulators(any of them), we get this error(0x80073CF6).
My phone is already developer unlocked. We have been successful in deploying it and running the application once, but now for some undetermined reason, it has stopped allowing us to do this.
I am willing to provide any more information if I can.
It seems if you remove anything from assets folder this error occurs. In my case I had removed splash screen image from assets folder after commenting splash screen line in manifest everything is OK.
Check this answer as well. This solved my problem!
Deploy error: Package could not be registered
You can remove the reference in the package.appxmanifest as well and the app will still deploy, as in:
It will work I got it.