"Couldn't add new handler" error

[walterw]

I'm getting a "Couldn't add new handler" error in one specific project.  If I create another project and follow the same steps everything works fine.  I've tried adding the handler in Windows & Mac versions but I get the same error.  I've also tried different menuitems, so it seems to be a general error adding a new handler.

I'm trying to add an EVT_MENU handler to a menuitem (wxSmith)

Does anyone know how to repair the project or what I should do to get around it?