<type 'exceptions.KeyError'>: u"Slot named 'service_connection_status' was not filled."

C:\Users\PRabahy\Documents\GitHub\tahoe-lafs\support\Lib\site-packages\nevow-0.10.0-py2.7.egg\nevow\flat\twist.py, line 24 in _drive
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    """
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    try:
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        next = iterable.next()
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    except StopIteration:
C:\Users\PRabahy\Documents\GitHub\tahoe-lafs\support\Lib\site-packages\nevow-0.10.0-py2.7.egg\nevow\flat\ten.py, line 83 in iterflatten
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    while rest:
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        gen = rest.pop()
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        for item in gen:
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            if isinstance(item, str):
C:\Users\PRabahy\Documents\GitHub\tahoe-lafs\support\Lib\site-packages\nevow-0.10.0-py2.7.egg\nevow\flat\flatstan.py, line 128 in TagSerializer
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        yield '>'
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        for child in original.children:
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            yield serialize(child, context)        
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        yield '</%s>' % original.tagName
C:\Users\PRabahy\Documents\GitHub\tahoe-lafs\support\Lib\site-packages\nevow-0.10.0-py2.7.egg\nevow\flat\ten.py, line 70 in serialize
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def serialize(obj, context):
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    #warnings.warn('serialize is deprecated; it has been renamed partialflatten.', stacklevel=2)
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    return partialflatten(context, obj)
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C:\Users\PRabahy\Documents\GitHub\tahoe-lafs\support\Lib\site-packages\nevow-0.10.0-py2.7.egg\nevow\flat\ten.py, line 61 in partialflatten
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    flattener = getFlattener(obj)
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    if flattener is not None:
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        return flattener(obj, context)
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C:\Users\PRabahy\Documents\GitHub\tahoe-lafs\support\Lib\site-packages\nevow-0.10.0-py2.7.egg\nevow\flat\flatstan.py, line 325 in PrecompiledSlotSerializer
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    try:
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        data = context.locateSlotData(original.name)
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    except KeyError:
C:\Users\PRabahy\Documents\GitHub\tahoe-lafs\support\Lib\site-packages\nevow-0.10.0-py2.7.egg\nevow\context.py, line 154 in locateSlotData
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                    return data
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            if currentContext.parent is None:
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                raise KeyError, "Slot named '%s' was not filled." % name
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            currentContext = currentContext.parent

<type 'exceptions.KeyError'>: u"Slot named 'service_connection_status' was not filled."