ubuntu tweak error when trying to open third party apps

Traceback (most recent call last):
  File "/usr/share/ubuntu-tweak/mainwindow.py", line 542, in setup_notebook
    page = page()
  File "/usr/share/ubuntu-tweak/thirdsoft.py", line 426, in __init__
    self.treeview = SourcesView()
  File "/usr/share/ubuntu-tweak/thirdsoft.py", line 260, in __init__
    self.update_model()
  File "/usr/share/ubuntu-tweak/thirdsoft.py", line 318, in update_model
    logo = gtk.gdk.pixbuf_new_from_file(get_source_logo(package))
GError: Failed to open file '/usr/share/ubuntu-tweak/data/applogos/avant-window-navigator.png': No such file or directory