Mysearch error

web.Server Traceback (most recent call last):
exceptions.AttributeError: 'module' object has no attribute '_URI'
/usr/lib/python2.7/dist-packages/twisted/web/server.py:189 in process
188                    self._encoder = encoder
189            self.render(resrc)
190        except:
/usr/lib/python2.7/dist-packages/twisted/web/server.py:238 in render
237        try:
238            body = resrc.render(self)
239        except UnsupportedMethod as e:
/usr/lib/python2.7/dist-packages/twisted/web/resource.py:250 in render
249            raise UnsupportedMethod(allowedMethods)
250        return m(request)
251
/home/michel/mysearch/mysearch/mysearch.py:349 in render_GET
348
349      search_request = SearchRequest(request, query, locale, backend_name, more_results)
350
/home/michel/mysearch/mysearch/mysearch.py:139 in __init__
138        self.backends_to_wait += 1
139        d = search_backend.search(self.query, self.locale, self.more_results)
140        d.addCallback(self.store_results, datatype)
/home/michel/mysearch/mysearch/backends.py:185 in search
184    agent = onion.OnionAgent(reactor, use_relay = self.use_relay )
185    d = agent.request('GET',self.get_query_url(), Headers({'User-Agent': [self.get_user_agent()]}), None)
186    d.addCallback(download_body)
/home/michel/mysearch/mysearch/onion.py:299 in request
298
299        parsedURI = client._URI.fromBytes(uri)
300
/usr/lib/python2.7/dist-packages/twisted/python/deprecate.py:399 in __getattribute__
398            # deprecated, there's no warning to issue.
399            value = getattr(state._module, name)
400        if name == '__path__':
exceptions.AttributeError: 'module' object has no attribute '_URI'