Can't pickle.

gistfile1.txt

2016-03-11 16:03:08 ERROR Zope.SiteErrorLog 1457683388.620.654171966413 http://192.168.15.156:8080/Wynyard/tests/@@edit
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 plone.z3cform.layout, line 66, in __call__
  Module plone.z3cform.layout, line 50, in update
  Module plone.dexterity.browser.edit, line 58, in update
  Module plone.z3cform.fieldsets.extensible, line 59, in update
  Module plone.z3cform.patch, line 30, in GroupForm_update
  Module z3c.form.group, line 145, in update
  Module plone.app.z3cform.csrf, line 21, in execute
  Module z3c.form.action, line 98, in execute
  Module z3c.form.button, line 315, in __call__
  Module z3c.form.button, line 170, in __call__
  Module plone.dexterity.browser.edit, line 30, in handleApply
  Module z3c.form.group, line 126, in applyChanges
  Module zope.event, line 31, in notify
  Module zope.component.event, line 24, in dispatch
  Module zope.component._api, line 136, in subscribers
  Module zope.component.registry, line 321, in subscribers
  Module zope.interface.adapter, line 585, in subscribers
  Module zope.component.event, line 32, in objectEventNotify
  Module zope.component._api, line 136, in subscribers
  Module zope.component.registry, line 321, in subscribers
  Module zope.interface.adapter, line 585, in subscribers
  Module plone.app.versioningbehavior.subscribers, line 65, in create_version_on_save
  Module Products.CMFEditions.CopyModifyMergeRepositoryTool, line 305, in save
  Module Products.CMFEditions.CopyModifyMergeRepositoryTool, line 450, in _recursiveSave
  Module Products.CMFEditions.ArchivistTool, line 267, in prepare
  Module Products.CMFEditions.ArchivistTool, line 221, in _cloneByPickle
TypeError: Can't pickle objects in acquisition wrappers.