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Mono's attempt on OS X is "Error: Framework" Mono / .NET 4.0 "is not installed."

I have a pretty simple application that I wrote in Visual Studio 2010 in C # using .NET 4.0. All forms have several buttons, shortcuts, TreeView, ComboBox, and TextBox.

I copied the project to my OS X installation and opened the solution (VS2010) in MonoDevelop. It opens perfectly (although I don’t know how to make the visual constructor display Form1), but when I run it, I get the following error: Error: Framework 'Mono / .NET 4.0' not installed.

The problem is that I have the latest version of Mono installed and it displays correctly (I think) in MonoDevelop. When I go to MonoDevelop-> Preferences -> .NET Runtimes, it lists Mono 2.6.7 as the default value.

So,

  • How to get a visual constructor for Form1.cs?

  • How to get rid of the "Mono / .NET 4.0 not installed" error and get a project to compile and run?

  • All I did was copy the solution in OS X and then open it in MonoDevelop. Is there any kind of transformation process that a project should go through?

Thanks in advance!

Change . Suppose I have to provide specific version information. :)

OS X:        10.6.5 Snow Leopard
MonoDevelop: 2.4.2
Mono:        2.6.7 (shown in MonoDevelop in .NET Runtimes as 2.6.7 (Default))

I also launched a new project with an empty GTK form and was able to compile / run it.

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1 answer

Mono 2.6.7 does not provide a .net 4.0 / C # 4 profile. You must upgrade at least to Mono 2.8.

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