Someone

System.TypeInitializationException was unhandled
  Message="The type initializer for 'EditorStock' threw an exception."
  Source="supertux-editor"
  TypeName="EditorStock"
  StackTrace:
       at Application..ctor(String[] args) in C:\Documents and Settings\Arvid\Skrivbord\supertux\supertux-sharp\supertux-editor\Application.cs:line 114
       at Application.Main(String[] args) in C:\Documents and Settings\Arvid\Skrivbord\supertux\supertux-sharp\supertux-editor\Application.cs:line 566
       at System.AppDomain.nExecuteAssembly(Assembly assembly, String[] args)
       at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()