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.
Contact your system administrator. Package deployment is blocked by Application Control Policies. Package deployment is blocked by the "Allow deployment operations in special profiles" policy. One of the possible reasons is a need for a roaming profile.
If there are no entries for the application under PackageList, then the issue has some other cause. In the case of the example event in this article, the full subkey is HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\AppModel\StateChange\PackageList\Microsoft.BingNews_8wekyb3d8bbwe!AppexNews\PackageStatus
Package deployment is blocked by Application Control Policies. Package deployment is blocked by the "Allow deployment operations in special profiles" policy. One of the possible reasons is a need for a roaming profile. For information about setting up Roaming User Profiles on user accounts, see Deploy Roaming User Profiles.
The package failed update, dependency, or conflict validation. Possible causes: The incoming package conflicts with an installed package. A specified package dependency can't be found. The package doesn't support the correct processor architecture. For more informtion, check the AppXDeployment-Server event log.
May be you are missing icon image in your manifest file. Please look at this.
There's also a possibility that the GUIDs listed in your Package.appxmanifest file don't match the ones in WMAppManifest.xml.
I had to do some changes to the first one before publishing a beta version of my app to the store and didn't update the second. Specifically
PhonePublisherId should match PublisherID
PhoneProductId should match ProductID
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.
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