setup: Mac OsX Lion, Xamarin Studio 4.0.8, Mono 2.10.12
problem: error - Framework 'Mono / .NET 4.5' not installed.
trigger: while having a C# running, changing 'Xamarin Studio', 'Preferences', '.Projects', '.NET Runtimes', will provoke following error while switching between .NET 2012 and .NET 2010. Putting .NET 2012 back to .NET 2010 doesn't help: while building programs that used to work, the error remains.
question: does anyone knows a solution for this problem please or can someone tell me what's happening here?
Thank you !