gbtrayicon.c:42: warning: assignment from incompatible pointer type

On line 42:
tray_image = GTK_IMAGE(image);

where:
static GtkWidget* tray_image = NULL;
gb_tray_icon_init(GtkImage* image);

The other thing:
main.c:93: warning: passing argument 1 of ‘gb_tray_icon_init’ from incompatible pointer type
where main.c:93 is:
GtkWidget *image;
image = gtk_image_new_from_file ("...");
gb_tray_icon_init(image)