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Editorial Team
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Asked: 2026-05-25T18:44:43+00:00

I’ve trying to open and convert an existing vs 2010 mvc 3 project in

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I’ve trying to open and convert an existing vs 2010 mvc 3 project in the new dev 11 preview and am running in to a difficult issue. The solution file will convert successfully, however the one mvc 3 web project in the solution shows in the solution explorer as unloaded post conversion. When i attempt to reload the project from solution explorer, i get prompted to convert the project and receive the following error in the upgradelog.xml

The project file’myproject.csproj’ cannot be opened. There is a missing project subtype. Subtype: ‘{E53F8FEA-EAE0-44A6-8774-FFD645390401}’ is unsupported by this installation.

From what i could track down, this has to do with MVC, but that doesn’t really help me work around the issue. Any suggestions or workarounds would be appreciated.

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  1. Editorial Team

    Update: Actually, MVC 3 for Visual Studio 11 Dev Preview has just been published: http://www.microsoft.com/download/en/details.aspx?id=1491

    We have not yet shipped MVC 3 support in Visual Studio 11. You can work around this by editing your csproj file and removing the project type GUID {E53F8FEA-EAE0-44A6-8774-FFD645390401}. This will cause your project to load like a normal WAP. You will be able to edit your code, however MVC-specific actions (Add Controller, etc) will not be available.

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