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When you install a NuGet package which uses a custom MSBuild .targets file, such as Xamarin.Forms, then an Import statement is added to the project. This import should have a Condition element which checks for the existence of the imported file.
Without the Condition added to the import when the project is opened with Visual Studio the project will fail to load if the packages are not restored.
Currently an import will be created similar to:
<Import Project="..\packages\Xamarin.Forms.184.108.40.20601\build\portable-win+net45+wp80+MonoAndroid10+MonoTouch10\Xamarin.Forms.targets" />
When it should be:
<Import Project="..\packages\Xamarin.Forms.220.127.116.1101\build\portable-win+net45+wp80+MonoAndroid10+MonoTouch10\Xamarin.Forms.targets" Condition="Exists('..\packages\Xamarin.Forms.18.104.22.16801\build\portable-win+net45+wp80+MonoAndroid10+MonoTouch10\Xamarin.Forms.targets')"/>
This should be fixed in commit: