Question: Apologies. I am sure I should know where to look to deal with this but I do not:

The error below has appeared in my solution. I am not aware of why. 

> 
> The item
>  "obj\Release\ScruffyDuck.AirportDesignEditor.MainForm.resources" was
>  specified more than once in the "Resources" parameter. Duplicate
>  items are not supported by the "Resources" parameter. Airport Design
>  Editor
> 
> 
> 

Perhaps someone would be kind enough to put me out of my misery and tell me where to look.

Thanks

Answer: 
OK I found it. I have no idea how it happened. However it might be useful for the future. MainForm has a number of files containing different parts of the class. The main part has all the designer code and so on. Somehow a .resx file got created on one of the partial class files along with an InitializeComponent() method. Removing the extra .resx file got as far as reporting the duplicate method and removing that allowed the solution to compile again. It seems that though the file names are different (the error was in MainForm.EventHandlers) the two resx files are treated as the same even though they have different names.

I am now getting some exceptions but at least I can get the code running in the debugger again.
1. Just remove **obj** directory from HD manually.
2. Clear solution from Visual Studio (Right click on project in SolutionExplorer and select "Clear")
3. Rebuild solution.

Cause could be a fault of generated resource file, due some conflicts happened in your project.

*Should* work.

Regards.