This app does not support the contract specified or is not installed

I was successfully creating Windows Store Apps using Visual Studio 2013, using my dev account. VS has recently re-registered my ID as well.
Today, any Strore App (including "Mail", "Store", "PC Settings"...) not running nor any of project is not launching when I start debugging. It gives dialog as shown below. Also, as the app starts showing as installed in the
start screen, when I tap it there, it doesn't run. Just splash screen flashes for a few seconds and then disappears.
Microsoft Visual Studio
Unable to activate Windows Store app '3a829624-c06f-426b-8186-9312684573a2_bs4v6h88qrjp4!App'. The activation request failed with error 'This app does not support the contract specified or is not installed'.
See help for advice on troubleshooting the issue.
OK   Help   
If a post solves the problem you asked, please mark it as Answer.

This question needs to be asked on answers.microsoft.com. It is not a development question.
Matt Small - Microsoft Escalation Engineer - Forum Moderator
If my reply answers your question, please mark this post as answered.
NOTE: If I ask for code, please provide something that I can drop directly into a project and run (including XAML), or an actual application project. I'm trying to help a lot of people, so I don't have time to figure out weird snippets with undefined
objects and unknown namespaces.

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