I am trying to compile a small test build (written in C#) in Visual Studio. However, I get two errors when trying so and can't find the issue. No line's are given:

**Error 1:** *small\_project.csproj*

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> Cannot resolve Assembly or Windows Metadata file 'System.Configuration.dll'
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**Error 2:**

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> Type universe cannot resolve assembly: System.Configuration, Version 2.0.0.0, Culture=neutral, PublicKeyToken.. etc..
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I am new at developing with C# and XAML. Does someone know what could cause these errors?