It ist not possible to attach a file

[Peter Michael Berger]

This is zim 0.66
Platform: posix
Locale: de_AT UTF-8
FS encoding: UTF-8
Python: (2, 7, 6, 'final', 0)
Gtk: (2, 24, 23)
Pygtk: (2, 24, 0)
No bzr version-info found

======= Traceback =======
  File "/usr/lib/python2.7/dist-packages/zim/gui/widgets.py", line 3194, in do_response
    destroy = self.do_response_ok()
  File "/usr/lib/python2.7/dist-packages/zim/gui/__init__.py", line 2858, in do_response_ok
    file = self.ui.do_attach_file(self.path, file)
  File "/usr/lib/python2.7/dist-packages/zim/gui/__init__.py", line 1197, in do_attach_file
    file.copyto(dest)
  File "/usr/lib/python2.7/dist-packages/zim/fs.py", line 1664, in copyto
    assert isinstance(dest, (File, Dir))
AssertionError: