The 'Nobel-Prize-Winners_-_19-09-05' instance failed to start.

Check the log file at '/usr/local/flamenco/instances/Nobel-Prize-Winners_-_19-09-05/log.txt' for more details. Here are the last few lines:

  File "../../webware/WebKit/Application.py", line 776, in respond
    transaction.respond()
  File "../../webware/WebKit/Transaction.py", line 105, in respond
    self._servlet.respond(self)
  File "../../webware/WebKit/HTTPServlet.py", line 38, in respond
    method(trans)
  File "../../webware/WebKit/Page.py", line 34, in respondToGet
    self._respond(transaction)
  File "../../webware/WebKit/Page.py", line 73, in _respond
    self.writeHTML()
  File "/usr/local/flamenco/python/Page.py", line 111, in writeHTML
    self.body(self.out)
  File "/usr/local/flamenco/python/InterfaceBase.py", line 186, in body
    out.write(self.page())
  File "/usr/local/flamenco/python/InterfaceBase.py", line 506, in page
    return div(self.middlegame(), c='middlegame')
  File "/usr/local/flamenco/python/FrankenMatrix.py", line 168, in middlegame
    return self.mainmiddlegame()
  File "/usr/local/flamenco/python/FrankenMatrix.py", line 197, in mainmiddlegame
    tr(td(self.middlegamematrix())))
  File "/usr/local/flamenco/python/FrankenMatrix.py", line 226, in middlegamematrix
    showtooltips=self.session.showtooltips)
  File "/usr/local/flamenco/python/components.py", line 291, in facetmatrix
    if subcats:
TypeError: __nonzero__ should return an int