Microsoft Windows Phone – “0x89731812”

0x89731812

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

Cause:
Connection to device failed.

Solution:
Disconnect and Reconnect the USB Cable, verify that Zune running and unlock the screen.

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‘DataContractJsonSerializer’ does not exist in the namespace ‘System.Runtime.Serialization.Json’

The type or namespace name ‘DataContractJsonSerializer’ does not exist in the namespace ‘System.Runtime.Serialization.Json’ (are you missing an assembly reference?)

in Italian:

Il tipo o il nome dello spazio dei nomi ‘DataContractJsonSerializer’ non esiste nello spazio dei nomi ‘System.Runtime.Serialization.Json’; probabilmente manca un riferimento a un assembly

Solution:

Add the following References to your project:

System.Runtime.Serialization
System.ServiceModel.Web

In Solution Explorer, right-click on the project node and click Add Reference to select the dll files.
Remember to add using or Imports lines inside your file.

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