Error Message ‘Glib::ObjectBase::ObjectBase()’ is protected

[kenton wilson gmail com]

I'm getting an error message when I compile and it isn't obvious to me
what is wrong. I've googled but to no avail.  Do the following error
messages bring any vague recollections as to the what the problem
might be?

Kenton

/usr/include/glibmm-2.4/glibmm/objectbase.h: In constructor
?uim::Main_screen::Main_screen()?:
/usr/include/glibmm-2.4/glibmm/objectbase.h:61:3: error:
?Glib::ObjectBase::ObjectBase()? is protected
Main_screen.cc:12:53: error: within this context
/usr/include/glibmm-2.4/glibmm/objectbase.h:86:11: error:
?Glib::ObjectBase::~ObjectBase()? is protected
Main_screen.cc:12:53: error: within this context