PluggableAuthService NotCompetent plugin listing error

[Elizabeth Leddy]

Plone just bumped zope versions and now the debug output it littered with a NonCompetent error:

2012-10-26 16:57:53 DEBUG PluggableAuthService NotCompetent plugin listing error
Traceback (most recent call last):
  File "/Users/eleddy/buildouts/digiyoubuildout/dev-eggs/Products.PluggableAuthService-1.9.0-py2.6.egg/Products/PluggableAuthService/PluggableAuthService.py", line 537, in _isNotCompetent
    not_competents = plugins.listPlugins( INotCompetentPlugin )
  File "/Users/eleddy/buildouts/digiyoubuildout/dev-eggs/Products.PluginRegistry-1.3-py2.6.egg/Products/PluginRegistry/PluginRegistry.py", line 106, in listPlugins
    for plugin_id in self._getPlugins(plugin_type):
  File "/Users/eleddy/buildouts/digiyoubuildout/dev-eggs/Products.PluginRegistry-1.3-py2.6.egg/Products/PluginRegistry/PluginRegistry.py", line 385, in _getPlugins
    raise KeyError, plugin_type
KeyError: <InterfaceClass Products.PluggableAuthService.interfaces.plugins.INotCompetentPlugin>

It seems like an upgrade step is missing, since the site doesn't know about this plugin. The exception is actually swallowed, but I have serious doubt that it should be throwing.

This is on Plone 4.2.2, which just bumped to 1.9.0. pinning to Products.PluggableAuthService at 1.8.0 for the moment removes the exception.