Unrecognized attribute 'targetFramework'. Note that attribute names are case-sensitive

I just installed vs 2010, followed by IIS in window 7. when building a website in .net framework 4.0 and convert this into application in IIS then its shows this error

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If i remove the targetFramework="4.0" from web config file then it shows me a second error which is related to linq reference error

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This all happening when i am using localhost to run my website but whenever i use just f5 in vs 2010 then its run perfectly.

When i want to attach my process with aspnet_wp.exe i don't find this process in my list.

I searched a lot of answers here. What am I missing.


Solution 1:

The problem could be:

  • the Application Pool for your site is configured for .NET Framework Version = v2.0.XXXXX
  • .NET 4 isn't installed on your server.

See also

  • Unrecognized attribute 'targetFramework' ...
  • How to add ASP.NET 4.0 ...

... which helped me fix a similar issue.

Solution 2:

You'll likely need to re-register ASP.Net version 4 with IIS.

Navigate to your .net framework 4.0 folder, and run aspnet_regiis.exe -i

For example, my .net framework 4.0 folder (Server 2k8 R2 x64) was located at: C:\Windows\Microsoft.NET\Framework64\v4.0.30319