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 grokcore.view.components, line 150, in __call__
  Module grokcore.view.components, line 154, in _render_template
  Module five.grok.components, line 130, in render
  Module zope.pagetemplate.pagetemplate, line 132, in pt_render
  Module five.pt.engine, line 93, in __call__
  Module z3c.pt.pagetemplate, line 163, in render
  Module chameleon.zpt.template, line 258, in render
  Module chameleon.template, line 171, in render
  Module 379629eca2d2ead08ab9151fadce2d7d, line 191, in render
  Module 25c76022a3d7cc7bbc181544290ba40b, line 1393, in render_master
  Module 25c76022a3d7cc7bbc181544290ba40b, line 613, in render_content
  Module 379629eca2d2ead08ab9151fadce2d7d, line 154, in __fill_main
  Module five.pt.expressions, line 161, in __call__
  Module collective.cover.layout, line 128, in render_view
  Module zope.browserpage.viewpagetemplatefile, line 83, in __call__
  Module zope.browserpage.viewpagetemplatefile, line 51, in __call__
  Module zope.pagetemplate.pagetemplate, line 132, in pt_render
  Module five.pt.engine, line 93, in __call__
  Module z3c.pt.pagetemplate, line 163, in render
  Module chameleon.zpt.template, line 258, in render
  Module chameleon.template, line 191, in render
  Module chameleon.template, line 171, in render
  Module 65180e6a5f40b2307da154b17f3b9433, line 102, in render
  Module collective.cover.layout, line 42, in get_layout
  Module plone.registry.registry, line 74, in forInterface
KeyError: 'Interface `collective.cover.controlpanel.ICoverSettings` defines a field `grid_system`, for which there is no record.'

 - Expression: "layout/render_view"
 - Filename:   ... a11-py2.7.egg/collective/cover/browser/templates/view.pt
 - Location:   (line 18: col 32)
 - Source:     tal:replace="structure layout/render_view" />
                                      ^^^^^^^^^^^^^^^^^^
 - Expression: "python:view.get_layout(mode)"
 - Filename:   ... y2.7.egg/collective/cover/layout_templates/pagelayout.pt
 - Location:   (line 10: col 41)
 - Source:     ... on repeat="section python:view.get_layout(mode)">
                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 - Arguments:  repeat: {...} (0)
               context: <ImplicitAcquisitionWrapper home at 0x7fdbdaaf9fa0>
               views: <ViewMapper - at 0x7fdbcff5b6d0>
               modules: <TraversableModuleImporter - at 0x7fdbe6c81c10>
               args: <tuple - at 0x7fdbee114050>
               loop: {...} (0)
               nothing: <NoneType - at 0x920190>
               target_language: pt_BR
               default: <object - at 0x7fdbee0304f0>
               request: <instance - at 0x7fdbcfb4e908>
               wrapped_repeat: {...} (0)
               mode: view
               template: <ViewPageTemplateFile - at 0x7fdbcf986f10>
               translate: <function translate at 0x7fdbcffb68c0>
               options: {...} (1)
               view: <PageLayout layout at 0x7fdbcff5b5d0>