AttributeError: 'Visitor' object has no attribute '_push'

Traceback (innermost last):
  Module ZPublisher.Publish, line 138, in publish
  Module ZPublisher.mapply, line 77, in mapply
  Module ZPublisher.Publish, line 48, in call_object
  Module Products.Five.browser.metaconfigure, line 485, in __call__
  Module Products.Five.browser.pagetemplatefile, line 125, in __call__
  Module Products.Five.browser.pagetemplatefile, line 59, in __call__
  Module zope.pagetemplate.pagetemplate, line 132, in pt_render
  Module, line 93, in __call__
  Module, line 163, in render
  Module chameleon.zpt.template, line 261, in render
  Module chameleon.template, line 191, in render
  Module chameleon.template, line 171, in render
  Module, line 982, in render
  Module, line 1223, in render_master
  Module, line 438, in render_content
  Module, line 71, in render_content_provider
  Module zope.viewlet.manager, line 112, in update
  Module zope.viewlet.manager, line 118, in _updateViewlets
  Module, line 58, in update
  Module plone.memoize.view, line 47, in memogetter
  Module, line 238, in actions
  Module Products.CMFPlone.ActionsTool, line 82, in listActionInfos
  Module Products.CMFCore.ActionInformation, line 206, in __getitem__
  Module Products.CMFCore.Expression, line 47, in __call__
  Module zope.tales.expressions, line 217, in __call__
  Module Products.PageTemplates.Expressions, line 155, in _eval
  Module Products.PageTemplates.Expressions, line 105, in render
  Module Products.PageTemplates.ZRPythonExpr, line 73, in call_with_ns
AttributeError: 'Visitor' object has no attribute '_push'

 - Expression: "provider:plone.belowcontentbody"
 - Filename:   ... egg/Products/CMFPlone/browser/templates/
 - Location:   (line 108: col 74)
 - Source:     ... 
 - Arguments:  repeat: {...} (0)
               template: <ViewPageTemplateFile - at 0xb1eb9eccL>
               views: <ViewMapper - at 0xafdb4a2cL>
               modules: <instance - at 0xb63ec54cL>
               args: <tuple - at 0xb743a02cL>
               here: <ImplicitAcquisitionWrapper 4efb514d at 0xb1aa634cL>
               user: <ImplicitAcquisitionWrapper - at 0xb1e13aa4L>
               nothing: <NoneType - at 0x839dd28>
               container: <ImplicitAcquisitionWrapper 4efb514d at 0xb1aa634cL>
               request: <instance - at 0xb011a6ccL>
               wrapped_repeat: <SafeMapping - at 0xb1a4334cL>
               traverse_subpath: <list - at 0xb011acccL>
               default: <object - at 0xb74606e0L>
               loop: {...} (2)
               context: <ImplicitAcquisitionWrapper 4efb514d at 0xb1aa634cL>
               view: <SimpleViewClass from /home/apan/Plone/buildout-cache/eggs/ album_view at 0xb011aa2cL>
               translate: <function translate at 0xb158541cL>
               root: <ImplicitAcquisitionWrapper Zope at 0xb1c1975cL>
               options: {...} (0)
               target_language: <NoneType - at 0x839dd28>

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