Python client error

Hey, the current Python client gives me the following error:

Traceback (most recent call last):
File "cb.py", line 5, in
couchbase = Couchbase("127.0.0.1:8091", "default", "")
File "/usr/local/lib/python2.7/dist-packages/couchbase/client.py", line 61, in __init__
self.couch_api_base = config["nodes"][0].get("couchApiBase")
TypeError: 'instancemethod' object has no attribute '__getitem__'

What can I do?

"""
from couchbase.client import Couchbase

couchbase = Couchbase("127.0.0.1:8091", "default", "")

bucket = client["default"]

print bucket.get("test")
"""

... Ubuntu 12.10