Traceback (most recent call last):
  File "/usr/share/kupfer/kupfer/ui/browser.py", line 1615, in _activate
    self.data_controller.activate(ui_ctx=self._make_gui_ctx())
  File "/usr/share/kupfer/kupfer/core/data.py", line 800, in activate
    res, ret = ctx.run(leaf, action, sobject, ui_ctx=ui_ctx)
  File "/usr/share/kupfer/kupfer/core/commandexec.py", line 303, in run
    ret = activate_action(execution_token, obj, action, iobj)
  File "/usr/share/kupfer/kupfer/core/commandexec.py", line 80, in activate_action
    return _activate_action_single(obj, action, iobj, kwargs)
  File "/usr/share/kupfer/kupfer/core/commandexec.py", line 86, in _activate_action_single
    ret = action.activate(obj, iobj, **kwargs)
  File "/usr/share/kupfer/kupfer/plugin/commands.py", line 131, in activate
    utils.AsyncCommand(argv, finish_callback, None, stdin=leaf.object)
  File "/usr/share/kupfer/kupfer/utils.py", line 126, in __init__
    standard_error=True, flags=flags, envp=env)
TypeError: glib.spawn_async: second argument must be a sequence of strings