Please got to the menu and slect "Help / debug messages". Scroll to the top of the opened window. It should show the gtk and glib version.
I assume you are using GTK3, the debugger plugin is not (yet) available for GTK3. -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://github.com/geany/geany-plugins/issues/758#issuecomment-404606863
