I am using monodevelop and I am getting a “framework mono/.NET 4.0 not installed” error when I try to build?

IIRC MonoDevelop 2.4 had a bug that prevented it targeting the final released version of . NET 4.0. The fix should be in MonoDevelop 2.4.1.

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The fun part is, I do have . NET 4.0 installed, as well as all GTK#. I thought maybe I installed it in the wrong order or something ridiculous, so I uninstalled and re-installed everything.

I even tried installing plain old mono, and then installing monodevelop, but I still get that same error. Mono monodevelop link|improve this question asked Oct 16 '10 at 19:50gentuba1313.

IIRC MonoDevelop 2.4 had a bug that prevented it targeting the final released version of . NET 4.0. The fix should be in MonoDevelop 2.4.1.

As a workaround, assuming you installed Mono 2.8 (which has 4.0 support), you can change your target runtime to Mono instead of .NET. Either Change the default using the Tools -> Options menu, then the . NET Runtimes panel or Change the target of the current project using the Project->Target Runtime menu.

Thank you so much! It finally works! – gentuba Oct 17 '10 at 17:49 I found a great shell script to install latest mono and monodevelop here: integratedwebsystems.com/2011/03/… – Jeffrey Cameron May 25 '11 at 1:03.

I had the same problem when I copy a project from Visual Studio under MS Windows 7 to Mono. But when you make your one project and copy the files into the project I do not get the error message any more. But I do not kwow I your situation is the same.

Your new project is probably referencing v3.5 instead of v4. – David Lively Apr 6 '11 at 21:44.

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