Bug#656640: system-config-printer: same problem for me during printer installation

[gpe]

Package: system-config-printer
Version: 1.3.7-3
Followup-For: Bug #656640

for me the error appears at the end of the installation when I click on
"Apply"

-- System Information:
Debian Release: wheezy/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: i386 (i686)

Kernel: Linux 3.2.0-1-686-pae (SMP w/2 CPU cores)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages system-config-printer depends on:
ii  gnome-icon-theme    3.2.1.2-1
ii  python              2.7.2-10
ii  python-cups         1.9.48-1+b1
ii  python-cupshelpers  1.3.7-3
ii  python-dbus         0.84.0-3
ii  python-glade2       2.24.0-3
ii  python-gnome2       2.28.1+dfsg-1
ii  python-gtk2         2.24.0-3
ii  python-libxml2      2.7.8.dfsg-7
ii  python-notify       0.1.1-3
ii  python-support      1.0.14

Versions of packages system-config-printer recommends:
ii  cups-pk-helper              0.2.1.2-1
ii  system-config-printer-udev  1.3.7-3

Versions of packages system-config-printer suggests:
pn  python-gnomekeyring  2.32.0+dfsg-1
pn  python-smbc          <none>
pn  sessioninstaller     <none>

-- no debconf information