Choosing wallpaper bug: index out of range

[pamstr]

I tried to choose wallpaper in "General" tab. I got:

(gdm3setup:11321): GnomeDesktop-WARNING **: Unable to create an input stream for file:///usr/share/backgrounds/gnome/Signpost_of_the_Shadows.jpg: Nie ma takiego pliku ani katalogu
Traceback (most recent call last):
  File "/usr/bin/gdm3setup", line 340, in _Clicked
    self.Dialog = WallpaperSelectorDialog()
  File "/usr/bin/gdm3setup", line 309, in __init__
    self.Widget = WallpaperSelectorWidget()
  File "/usr/bin/gdm3setup", line 189, in __init__
    self.LoadInformations(targetfile)
  File "/usr/bin/gdm3setup", line 225, in LoadInformations
    self.StartTime = int(nodeset[0].text)
IndexError: list index out of range

I created file Signpost_of_the_Shadows.jpg by copying another one, to eliminate first bug. I don't even know if it's related to gdm3setup, but it's first time I got it.

gdm3setup works after this bug.

I'm using Debian Jessie with:
https://github.com/Nano77/various/blob/master/deb/gdm3setup/debian/gdm3setup-20131026-1.deb
https://github.com/Nano77/various/blob/master/deb/gdm3setup-utils/debian/gdm3setup-utils-20131030-1.deb