<type 'exceptions.AttributeError'>: MutableFileNode instance has no attribute '_writekey'

/home/francois/dev/tahoe/Twisted-8.1.0-py2.5-linux-x86_64.egg/twisted/internet/defer.py, line 328 in _runCallbacks
326
                    self._runningCallbacks = True
327
                    try:
328
                        self.result = callback(self.result, *args, **kw)
329
                    finally:
Locals
callback<bound method MutableCheckAndRepairer._maybe_repair of <allmydata.mutable.checker.MutableCheckAndRepairer instance at 0x3ffc830>>
self<Deferred at 0x3f367e8 current result: None>
args()
kw{}
/home/francois/dev/tahoe/src/allmydata/mutable/checker.py, line 300 in _maybe_repair
298
            return
299
        self.cr_results.repair_attempted = True
300
        d = self._node.repair(self.results)
301
        def _repair_finished(repair_results):
Locals
self<allmydata.mutable.checker.MutableCheckAndRepairer instance at 0x3ffc830>
/home/francois/dev/tahoe/src/allmydata/mutable/filenode.py, line 263 in repair
261
        assert ICheckResults(check_results)
262
        r = Repairer(self, check_results)
263
        d = r.start(force)
264
        return d
Locals
check_results<allmydata.check_results.CheckResults instance at 0x3ffc950>
r<allmydata.mutable.repairer.Repairer instance at 0x3ffaf80>
forceFalse
self<MutableFileNode 3ffc368 RO 6o2aak2l>
Globals
ICheckResults<InterfaceClass allmydata.interfaces.ICheckResults>
Repairer<class allmydata.mutable.repairer.Repairer at 0x2d89230>
/home/francois/dev/tahoe/src/allmydata/mutable/repairer.py, line 89 in start
87
        # say, added an smap.get_privkey() method.
88
89
        assert self.node.get_writekey() # repair currently requires a writecap
90
Locals
self<allmydata.mutable.repairer.Repairer instance at 0x3ffaf80>
smap<allmydata.mutable.servermap.ServerMap instance at 0x3fecd88>
/home/francois/dev/tahoe/src/allmydata/mutable/filenode.py, line 172 in get_writekey
170
171
    def get_writekey(self):
172
        return self._writekey
173
    def get_readkey(self):
Locals
self<MutableFileNode 3ffc368 RO 6o2aak2l>

<type 'exceptions.AttributeError'>: MutableFileNode instance has no attribute '_writekey'