Wrapping GApplication inside Gtk module

I'm writing a Gtk module for keyboard navigation like vimium in Chromium, so I'd like to add a keybinding to the host application using Gtk::Application.set_accel_for_action().

But when I try to call Gio::Application::get_default() in gtk_module_init(), the returned value is null, and a warning is issued: 

Glib::RefPtr<Gio::Application> application = Gio::Application::get_default();

(gedit:8868): glibmm-WARNING **: Failed to wrap object of type 'GeditAppX11'. Hint: this error is commonly caused by failing to call a library init() function.

While using pure C worked properly:

std::cout << g_application_get_application_id(g_application_get_default()) << std::endl;


I primarily used Gedit for testing, and using gtk3-widget-factory also produced the same output.

Any idea? Thanks in advance.

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