Crash when trying to open preferences

[jollywollup]

GTG crashes when I open preferences. I am using Kubuntu 16.04. Here is the traceback:

Traceback (most recent call last):
  File "/usr/share/gtg/GTG/gtk/browser/browser.py", line 416, in open_preferences
    self.vmanager.open_preferences(self.config)
  File "/usr/share/gtg/GTG/gtk/manager.py", line 239, in open_preferences
    self.preferences.activate()
  File "/usr/share/gtg/GTG/gtk/preferences.py", line 144, in activate
    self._refresh_preferences_store()
  File "/usr/share/gtg/GTG/gtk/preferences.py", line 129, in _refresh_preferences_store
    self.shortcut.refresh_accel()
  File "/usr/share/gtg/GTG/gtk/preferences.py", line 214, in refresh_accel
    self.new_task_binding = get_saved_binding()
  File "/usr/share/gtg/GTG/tools/shortcut.py", line 50, in get_saved_binding
    list_keys = call_subprocess(CHECK_VERSION).splitlines()
  File "/usr/share/gtg/GTG/tools/shortcut.py", line 160, in call_subprocess
    out = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
  File "/usr/lib/python2.7/subprocess.py", line 711, in __init__
    errread, errwrite)
  File "/usr/lib/python2.7/subprocess.py", line 1340, in _execute_child
    raise child_exception
OSError: [Errno 2] No such file or directory