I received the following error:
% main
_Main
Application._CallFunctionWithExceptionHandling%%op
Delegate.Invoke%%
AddHandler.Stub.15%%
Delegate.IM_Invoke%%o
Window1.Window1.open_files_Action%%o<Window1.Window1>o
AddHandler.Stub.15%%
Delegate.IM_Invoke%%o
Window1.Window1.openkml_Action%%o<Window1.Window1>o