I tried installing Xamarian Studio and it won't start. I checked the log files in C:\Users\lavendbr\AppData\Local\XamarinStudio-6.0\Logs and it reported the below error. I looked at my system and I had an old version of gtk-sharp 2.99.3. I had some problems removing the library since it couldn't find the original media. I used a tool from Microsoft to remove the gtk-sharp 2.99.3 and then I tried reinstalling gtk-sharp-2.12.45.msi several times. Each time, it seems to come up with the same error in the log file. I am not sure why it can't find the libraries. I have been going in circles on this. Any tips?
System.TypeInitializationException: The type initializer for 'MonoDevelop.Ide.ImageService' threw an exception. ---> System.MissingMethodException: Method not found: '!!0 System.Array.Empty()'.
at MonoDevelop.Ide.ImageService..cctor() in C:\data\lanes\3510\0ccfcd52\source\monodevelop\main\src\core\MonoDevelop.Ide\MonoDevelop.Ide\ImageService.cs:line 49
--- End of inner exception stack trace ---
at MonoDevelop.Ide.IdeStartup.Run(MonoDevelopOptions options) in C:\data\lanes\3510\0ccfcd52\source\monodevelop\main\src\core\MonoDevelop.Ide\MonoDevelop.Ide\IdeStartup.cs:line 209
FATAL ERROR [2017-09-21 15:52:28Z]: Xamarin Studio failed to start. Some of the assemblies required to run Xamarin Studio (for example gtk-sharp)may not be properly installed in the GAC.
System.MissingMethodException: Method not found: '!!0 System.Array.Empty()'.