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Home/ Questions/Q 8992983
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Editorial Team
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Editorial Team
Asked: June 15, 20262026-06-15T23:05:23+00:00 2026-06-15T23:05:23+00:00

I am trying to run my web application and I get this error Unable

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I am trying to run my web application and I get this error

Unable to attach to application ‘iisexpress.exe’ (PID 708) using ”. The version of clr.dll in the target does not match the one mscordacwks.dll was built for. Do you want to continue anyway?

This was working yesterday. I have a feeling something has gor corrupted somewhere.

Any idea what is going on here?

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  1. Editorial Team
    Editorial Team
    2026-06-15T23:05:24+00:00Added an answer on June 15, 2026 at 11:05 pm

    I just had the same problem and I stumbled upon your question. But then I also stumbled upon these:

    The version of clr.dll does not match the one mscordacwks.dll was built for

    The version of clr.dll in the target does not match the one mscordacwks.dll was built for

    One of 3 things seemed to work for everyone.

    1. Restart Visual Studio.
    2. If you recently had a windows update but a restart is still pending, then restart your computer.
    3. Install Visual Studio 2010 Service Pack 1 from Visual Studio Subscriptions site: https://my.visualstudio.com/Downloads?q=visual%20studio%202010%20service%20pack%201
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