When trying de-select "Animated Apron Vehicles" in the FSDG Configurator for St.Lucia the following error is generated;

This is the text from the log file.
System.IO.IOException: Cannot create a file when that file already exists.
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.__Error.WinIOError()
at System.IO.File.InternalMove(String sourceFileName, String destFileName, Boolean checkHost)
at System.IO.File.Move(String sourceFileName, String destFileName)
at _FSDGScenConfig.Main.Checkbox_Click(Object sender, EventArgs e)
All other options for St.Lucia can be enabled or disabled without error.
Please help.