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Home/ Questions/Q 6016559
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Editorial Team
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Editorial Team
Asked: May 23, 20262026-05-23T02:59:59+00:00 2026-05-23T02:59:59+00:00

Within my project I have gotten this error: Error 1 The type or namespace

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Within my project I have gotten this error:

Error 1 The type or namespace name ‘UI’ does not exist in the namespace ‘System.Web’ (are you missing an assembly reference?)

So, basically I attempted to add “system.web” as a reference to my project, but there is no such thing exist in my .NET framework.

How can I install “system.web”?

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  1. Editorial Team
    Editorial Team
    2026-05-23T03:00:00+00:00Added an answer on May 23, 2026 at 3:00 am

    If the kind of project the reference is being added to is not a web project, then you may need to right click the project and change the target framework from .NET 4 Client to just .NET 4.

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