SDK update for Windows Phone 7.8 – “The element “Deployment” in namespace “http://schemas.microsoft.com/windowsphone/2009/deployment” has invalid child element “AppExtra”. List of possible elements expected: “App”.”

The element “Deployment” in namespace “http://schemas.microsoft.com/windowsphone/2009/deployment” has invalid child element “AppExtra”. List of possible elements expected: “App”.

In Italian

L’elemento “Deployment” nello spazio dei nomi “http://schemas.microsoft.com/windowsphone/2009/deployment” ha un elemento figlio non valido “AppExtra”. Elenco di possibili elementi previsti: “App”.

Cause:
Installing the Windows Phone 8 SDK, the schema files of the previous version will update too. If you haven’t installed it and you want to work with Visual Studio 2010 you have an old version of schemas that not contains the <AppExtra> node, so the error appears because the xsd file cannot validate your WMAppManifest.xml file with the new lines

<?xml version="1.0" encoding="utf-8"?>
<Deployment xmlns="http://schemas.microsoft.com/windowsphone/2009/deployment" AppPlatformVersion="7.1">
  <AppExtra xmlns="" AppPlatformVersion="8.0">
    <Extra Name="Tiles"/>
  </AppExtra>

Solution:
Download and replace the following files inside you Visual Studio 2010 installation folder at the path like this:

C:\\Program Files\\Microsoft Visual Studio 10.0\\Xml\\Schemas

Rename the Microsoft.Phone.PreImport.targets file in

C:\\Program Files\\MSBuild\\Microsoft\\Silverlight for Phone\\v4.0

append “_” at the end of the filename: Microsoft.Phone.PreImport.targets_ (I’m searching other ways for this part of solution)

Close and re-open Visual Studio 2010 then Rebuild your solution.

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Microsoft Windows Phone – “0x81030120”

0x81030120

The above error message appears when you try to deploy a Windows Phone Project to a physical Windows Phone device.

Solution:

Remove ID_CAP_INTEROPSERVICES capabilities

<Capability Name="ID_CAP_INTEROPSERVICES" />

inside application manifest WMAppmanifest.xml file.

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HOW TO change the StartPage in Windows Phone 7 Application in Visual Studio 2010 [C#.NET]

Expand theĀ Properties folder into Solution Explorer of the VisualĀ C# Windows Phone Application Project and Open the WMAppManifest.xml file.
Change the NavigationPage with you new StartPage filename (case sensitive).

    <Tasks>
      <DefaultTask  Name ="_default" NavigationPage="MainPage.xaml"/>
    </Tasks>

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HOW TO change the StartPage of the Windows Phone 7 Application in Visual Studio 2010 [VB.NET]

Expand the My Project folder into Solution Explorer of the Visual Basic Windows Phone Application Project and Open the WMAppManifest.xml file.
Change the NavigationPage with you new StartPage filename (case sensitive).

    <Tasks>
      <DefaultTask  Name ="_default" NavigationPage="MainPage.xaml"/>
    </Tasks>

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