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Could not load file or assembly 'AjaxControlToolkit' or one of its dependencies. The parameter is incorrect. (Exception from HRESULT: 0x80070057 (E_INVALIDARG))

I was working on my asp.net (4.0) application, when I had a power fail.  When the machine rebooted, I get the error (in the title) when I try and run the app.  I can deploy it and run on another server ok.  I am trying to use the ASP.Net Development Server.

I can run another (similar) project ok, so it seems to be project related.  All code was checked in, so I don't think my code changed.  What could be causing this?
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mr-kenny
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Fixed.  Thanks.

Deleted all files in tem dir.