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

Question

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.

Solution 1

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.

Solution 2

you could easily change the framework under which tyour application is running to allow MonoDevelop build your's successfully by doing the following:

• open menu "Project"
• choose Application options
• from "General" tab, change the "Target framework" to be "Mono / .NET x"