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Editorial Team
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Asked: 2026-05-28T04:49:44+00:00

I am starting to learn MVC(3) following a tutorial. I am a developer so

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I am starting to learn MVC(3) following a tutorial. I am a developer so I know basics and I cannot find an answer on the web that is relavent enough to fix my issue.

All the MVC apps are the default start up code. I select an “internet application” and choose to user HTML5. F6, build works. Rebuild works. F5, debugging is a different story.

Compiler Error Message: CS1541: Invalid reference option: ‘C:\Users\Other\AppData\Local\Temp\Temporary ASP.NET Files\root\f20fc565\816eddc7\App_global.asax.lsdrp-bk.dll’ — cannot reference directories

I have searched my disc and no “App_global.asax.lsdrp-bk.dll” exists at all. Please help!

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  1. Editorial Team

    Shut down all of your visual studio web servers running in your system tray.

    Delete everything from:

    C:\Users\Other\AppData\Local\Temp\Temporary ASP.NET Files\

    That’s your first step.That’s a good starting point.
    The error shows up as:
    http://msdn.microsoft.com/en-us/library/2zyc8wkc(v=vs.90).aspx
    where it thinks App_global.asax.lsdrp-bk.dll is a folder for some strange reason.

    Also if you reference any other projects in your solution, re-add those references.

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