[sergeyvl12]

I don't use PBTK. But the same message appears in emulator for any pocketbook program for me:

serg@HOME:~/workspace/calc/obj_emu$ ./calc
** Message: Command 501 selected

hw_close

(<unknown>:3059): GLib-GObject-CRITICAL **: g_object_unref: assertion `G_IS_OBJECT (object)' failed

(<unknown>:3059): Gtk-WARNING **: A floating object was finalized. This means that someone
called g_object_unref() on an object that had only a floating
reference; the initial floating reference is not owned by anyone
and must be removed with g_object_ref_sink().



Did you mear "run with emulator" or "run with device". If first, this is a "normal" behavior. The problem is somewhere in emulator.