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Home/ Questions/Q 8141391
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Editorial Team
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Editorial Team
Asked: June 6, 20262026-06-06T12:29:32+00:00 2026-06-06T12:29:32+00:00

We are using Silverlight 4 (we must use it. :p ) with VS2010. AFAIK

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We are using Silverlight 4 (we must use it. :p ) with VS2010. AFAIK we have the proper toolkits and SDKs installed.

When we try to open a XAML file, we are immediately presented with an error dialog that says: “Value cannot be null. Parameter name: typeName”. The designer does not load. There is no output in the output window, there are no build errors.

We are at a complete loss on what to do.

This does only affect some of our workstations. We are in a controlled enviorment and reinstalling VS2010 is not really an option. Again :p

Thanks!

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  1. Editorial Team
    Editorial Team
    2026-06-06T12:29:35+00:00Added an answer on June 6, 2026 at 12:29 pm

    This seems to be an issue specific to our corporate environment. MS support has been helping us for several days now. They don’t seem any closer to a solution than we were.

    Good luck to anyone here with the same question.

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