When I try to add a class library project I got this error: the tools version 3.5 is unrecognized

When I try to add a class library project I got this error: the tools version 3.5 is u开发者_C百科nrecognized.

What can I do?

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I am assuming you are on Visual Studio 2008...

Here's a fix for this:

http://execucode.wordpress.com/2009/01/08/the-tools-version-35-is-unrecognized-error-on-visual-studio-2008-startup/

Quoted from the above entry:

Make sure these keys are present in the registry. If not present add it. This should resolve this issue.

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSBuild] [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSBuild\3.5] “DefaultToolsVersion”=”2.0″ [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSBuild\ToolsVersions] [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSBuild\ToolsVersions\2.0] “MSBuildToolsPath”=”C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727″ [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSBuild\ToolsVersions\3.5] “MSBuildToolsPath”=”C:\WINDOWS\Microsoft.NET\Framework\v3.5\”