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Error: Unrecognized attribute 'targetFramework'

Posted on 2011-02-23
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Last Modified: 2012-05-11
Hello,

I'm trying to get an ASP.NET application running on my local PC.

I have the site set in IIS 7 to use an Application pool version 4.0.30319

When I try to build the site in Visual Studio 2008, I get a Configuration error "Unrecognized attribute 'targetFramework'." at the line in web.config...

<compilation debug="false" targetFramework="4.0" />

The version information at the bottom of the browser error says that the .NET Framework is 2.0.50727.4952

So, it looks like there is an issue here.

How do I fix this?
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Question by:skbohler
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Éric Moreau earned 2000 total points
ID: 34960765
VS 2008 cannot target 4.0. Only VS2010 can. Looks like your solution has been open/created in VS2010.

Try removing that tag from your web.config or open the solution in VS2010.
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Author Comment

by:skbohler
ID: 34960947
OK, I opened it with VS2010, and it works. Thank you.
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LVL 3

Expert Comment

by:DanMerk
ID: 34960950
You should be able to set it to 3.5 without any issues. The difference between 3.5 and 4 is typically very small.
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