access_ok method of SubdocResult broken when it should return False

AttributeError                            Traceback (most recent call last)

<ipython-input-48-480e33981320> in <module>()

      9 print "Content of SubdocResult is: {0}".format(subDocumentNoField.get(missingFieldToRetrieve))

     10 

---> 11 subDocumentNoField.access_ok

/Users/simon/anaconda2/lib/python2.7/site-packages/couchbase/result.pyc in access_ok(self)

    154         :return: True if the document is accessible, False otherwise

    155         """

--> 156         return self.rc == 0 or self.rc == C.LCB_SUBDOC_MULTI_FAILRUE

    157 

    158     @property

AttributeError: 'module' object has no attribute 'LCB_SUBDOC_MULTI_FAILRUE'