I received the following error:
% main
Main
Application.CallFunctionWithExceptionHandling%%op
Delegate.Invoke%%
AddHandler.Stub.15%%
Delegate.IMInvoke%%o
Window1.Window1.openfilesAction%%o<Window1.Window1>o
AddHandler.Stub.15%%
Delegate.IMInvoke%%o
Window1.Window1.openkml_Action%%o<Window1.Window1>o