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I get this error when trying to run the application on local machine.
Error : DEP0700 : Registration of the app failed. error 0x80070078: The Visual Elements extension failed while processing the Notification element. (0x80073cf6)
Updated 5-Apr-13 12:32pm

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Error: DEP0700: Registration of the app failed. An internal error occurred.

So you've started your Windows 8 app development journey. All things are going smooth until one day you hit this error when trying to run/debug your app. The error says "Error: DEP0700: Registration of the app failed. An internal error occurred with error 0x80073D05. See for help diagnosing app deployment issues. (0x80073cf6)"

This is a very cryptic error and does not give you any info about what the problem actually is. The problem is that Visual Studio is not able to delete the application data in your local packages folder.

Don't worry, the solution is actually very simple. On your Windows 8 machine, go to C:\Users\<username>\AppData\Local\Packages\ folder. There you will find a folder that has your application's Package Family Name in it - you just need to delete that folder. The issue is that while your app is in development, it might have a random GUID as its Package Family Name, so the folder will also have that random GUID as its name which makes it hard to know which folder belongs to your app. Again, that is easy to find as well. Right click your project in Visual Studio and click properties. The value you see in the "Package Family Name" field is the name you should look for in the folder. Simply delete it and build your solution again and it will run like a charm.

2 things to keep in mind:
- Close Visual Studio and the simulator before deleting the folder to ensure smooth deletion.
- You may have to use an administrator account to delete that folder.
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that folder of package family name doesnot exist their in packages,
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