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Asked: 2026-05-26T14:25:09+00:00

System.Reflection.Adds.UnresolvedAssemblyException Type universe cannot resolve assembly: System, Version=2.0.0.0, Culture=neutral,… I just updated to Mango

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System.Reflection.Adds.UnresolvedAssemblyException
Type universe cannot resolve assembly: System,
Version=2.0.0.0,
Culture=neutral,...

I just updated to Mango and the 7.1 SDK and newest Silverlight Tool kit.

I have tried deleting and re-adding this reference, but I still get this error in design mode for a xaml page.

This looks like a really simple and stupid error on my part. Not sure what I should try next.

Also, it’s not an issue with unblocking a DLL, since as you can see, it’s System.dll.

Any ideas as to the root cause would be appreciated.

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1 Answer

  1. Editorial Team

    There was a reference I had added that was seemingly causing this. I can’t tell if it was the Facebook C# SDK or the IsolatedStorageExplorer library. Perhaps they aren’t up to date with Mango, it’s the only thought.

    Either way, I’m a little frustrated at the vague nature of the error and how it blows up in the XAML and not the code. I feel like the IDE should know where the error is coming and help you with a better stack trace. At this time, the only way to figure this stuff out is process of elimination. Delete all, add back one by one.

    I appreciate the help!

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