exception - AttributeError: 'Entry' object has no attribute 'getMergeProposals'

Exception in thread Thread-2:
Traceback (most recent call last):
  File "/usr/lib/python2.6/threading.py", line 525, in __bootstrap_inner
    self.run()
  File "/usr/lib/python2.6/threading.py", line 477, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/usr/bin/review-list", line 281, in __load_merges
    for c in lp_project.getMergeProposals(status="Needs review"):
  File "/usr/lib/python2.6/dist-packages/lazr/restfulclient/resource.py", line 571, in __getattr__
    return super(Entry, self).__getattr__(name)
  File "/usr/lib/python2.6/dist-packages/lazr/restfulclient/resource.py", line 309, in __getattr__
    % (self.__class__.__name__, attr))
AttributeError: 'Entry' object has no attribute 'getMergeProposals'