.so problem: assertion `wrap_func_table != 0' failed

["Germán Diago" <germandiago gmail com>]

Hello, I'm experiencing problems with some code.

The problem is that when I instantiate a widget from a .so file, the
following error occurs:

 glibmm-CRITICAL **: Glib::ObjectBase* Glib::wrap_create_new_wrapper(GObject*):

My main application calls Gtk::Main m(argc, argv) correctly and it's
the first thing it does.
 After that, it inits
a plugin system, loads a .so file which contains functions to
instantiate different widgets.
When I instantiate such widgets,
I get that error. I googled a lot and found something related to
Gtk::Main::init_gtkmm_internals();

But it didn't help. Any clue? I don't know where to find help for this.