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Editorial Team
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Asked: 2026-06-13T15:28:24+00:00

I’ve install Silverlight Toolkit from Nuget, but when I tried to run the project,

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I’ve install Silverlight Toolkit from Nuget, but when I tried to run the project, it throws me one error which tells me:

{System.IO.FileNotFoundException: Could not load file or assembly
‘System.Windows.Controls.Toolkit.Internals, Version=4.0.5.0,
Culture=neutral, PublicKeyToken=2c5c654d367bf4a7’ or one of its
dependencies. The system cannot find the file specified. File name:
‘System.Windows.Controls.Toolkit.Internals, Version=4.0.5.0,
Culture=neutral, PublicKeyToken=2c5c654d367bf4a7’}

So, I added this assembly in my project, and also is throwing me the error.

I start to think if I have to modify a nuget package or something like that.

Any suggestion is welcome.

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1 Answer

  1. Editorial Team

    For whatever reason, the System.Windows.Controls.Toolkit.Internals.dll is missing from the Silverlight Toolkit Core NuGet package. I ended up downloading the toolkit zip archive (Silverlight releases page on CodePlex), extracting the assembly locally, and adding a reference to it to my Silverlight project. After that, all was well.

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