The summary says it all:
Traceback:
File "/usr/lib/python2.3/site-packages/django/core/handlers/base.py" in get_response
82. response = callback(request, *callback_args, **callback_kwargs)
File "/usr/lib/python2.3/site-packages/django/contrib/formtools/wizard.py" in __call__
95. return self.render(form, request, current_step)
File "/usr/lib/python2.3/site-packages/django/contrib/formtools/wizard.py" in render
108. prev_fields.append(hidden.render(hash_name, old_data.get(hash_name, self.security_hash(request, old_form))))
File "/usr/lib/python2.3/site-packages/django/contrib/formtools/wizard.py" in security_hash
152. pickled = pickle.dumps(data, protocol=pickle.HIGHEST_PROTOCOL)
Exception Type: TypeError at /snelboeken/
Exception Value: dumps() takes no keyword arguments
this can be fixed easily by changing line 152 to:
pickled = pickle.dumps(data, pickle.HIGHEST_PROTOCOL)
this is exactly the same as was fixed for form preview in: http://code.djangoproject.com/changeset/6754?format=diff&new=6754