beginner question about extern

["beginner.c" <beginner c gmail com>]

Hi,

I'm having a problem with multiple files and using extern
In main.c I'm declaring

GtkWidget *a;
(...do a bunch of stuff successfully to a)

In another file:
extern GtkWidget *a;
(..do a bunch of stuff with error)

gtk_toggle_button_set_active: assertion failed ...blah blah failed.
I'm am typecasting in my second file as I am in the first file, it works in
the first file
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