Try something like this.
- open the project in Visual Studio.
- Right-click on your solution and select
Manage NuGet Packages... - Select the
Consolidate tab. This will install all your packages in the same and correct version.
Note 1: Not sure if something like this is in Xamarin Studio.
When I received this error, I uninstalled all my packages, go to the project folder delete folders. I started adding all packages manually from the very beginning.
This fixed the error for me for a while.
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