Why cant I load this file?

Question

You have to unzip it and try to run it.
When i try to run it , thats what i get

C:\Users\Alexander\Desktop\PaddleBattle\PaddleBattle\PaddleBattle\PaddleBattle.csproj : error  : Unable to read the project file 'PaddleBattle.csproj'. 
C:\Users\Alexander\Desktop\PaddleBattle\PaddleBattle\PaddleBattle\PaddleBattle.csproj(115,3): The imported project "C:\Program Files (x86)\MSBuild\Microsoft\Silverlight for Phone\v4.0\Microsoft.Silverlight.WindowsPhone71.Overrides.targets" was not found. Confirm that the path in the <Import> declaration is correct, and that the file exists on disk.
 





All i wanna do is see how they made this app so I can have an example to follow