see this trouble

Traceback (most recent call last):
  File "/usr/share/covergloobus/core/covergloobus.py", line 96, in init
    self.init_ui()
  File "/usr/share/covergloobus/core/covergloobus.py", line 152, in init_ui
    self._window.init()
  File "/usr/share/covergloobus/core/ui.py", line 138, in init
    self.load_xml(path + "/skin.xml")
  File "/usr/share/covergloobus/core/ui.py", line 183, in load_xml
    self.add_button(item)
  File "/usr/share/covergloobus/core/ui.py", line 313, in add_button
    button.add_state(State.PAUSED, **data)
  File "/usr/share/covergloobus/widgets/button.py", line 191, in add_state
    info, w, h = pixbuf_get_file_info(path)
TypeError: 'NoneType' object is not iterable

many thanks for the answer