我创建了一个不复杂的内容类型并允许讨论。显示添加评论的表单，但是当发表评论时，我得到了下一个错误：
2013-03-09 22:24:32 ERROR root Exception while rendering an error message
Traceback (most recent call last):
File "/home/daniel/.buildout/eggs/Zope2-2.13.19-py2.6.egg/OFS/SimpleItem.py", line 242, in raise_standardErrorMessage
v = s(**kwargs)
File "/home/daniel/.buildout/eggs/Products.CMFCore-2.2.7-py2.6.egg/Products/CMFCore/FSPythonScript.py", line 127, in __call__
return Script.__call__(self, *args, **kw)
File "/home/daniel/.buildout/eggs/Zope2-2.13.19-py2.6.egg/Shared/DC/Scripts/Bindings.py", line 322, in __call__
return self._bindAndExec(args, kw, None)
File "/home/daniel/.buildout/eggs/Zope2-2.13.19-py2.6.egg/Shared/DC/Scripts/Bindings.py", line 359, in _bindAndExec
return self._exec(bound_data, args, kw)
File "/home/daniel/.buildout/eggs/Products.PythonScripts-2.13.2-py2.6.egg/Products/PythonScripts/PythonScript.py", line 344, in _exec
result = f(*args, **kw)
File "Script (Python)", line 34, in standard_error_message
File "/home/daniel/.buildout/eggs/Zope2-2.13.19-py2.6.egg/Shared/DC/Scripts/Bindings.py", line 322, in __call__
return self._bindAndExec(args, kw, None)
File "/home/daniel/.buildout/eggs/Zope2-2.13.19-py2.6.egg/Shared/DC/Scripts/Bindings.py", line 359, in _bindAndExec
return self._exec(bound_data, args, kw)
File "/home/daniel/.buildout/eggs/Products.CMFCore-2.2.7-py2.6.egg/Products/CMFCore/FSPageTemplate.py", line 237, in _exec
result = self.pt_render(extra_context=bound_names)
File "/home/daniel/.buildout/eggs/Products.CMFCore-2.2.7-py2.6.egg/Products/CMFCore/FSPageTemplate.py", line 177, in pt_render
self, source, extra_context
File "/home/daniel/.buildout/eggs/Zope2-2.13.19-py2.6.egg/Products/PageTemplates/PageTemplate.py", line 79, in pt_render
showtal=showtal)
File "/home/daniel/.buildout/eggs/zope.pagetemplate-3.5.2-py2.6.egg/zope/pagetemplate/pagetemplate.py", line 113, in pt_render
strictinsert=0, sourceAnnotations=sourceAnnotations)()
File "/home/daniel/.buildout/eggs/zope.tal-3.5.2-py2.6.egg/zope/tal/talinterpreter.py", line 271, in __call__
self.interpret(self.program)
File "/home/daniel/.buildout/eggs/zope.tal-3.5.2-py2.6.egg/zope/tal/talinterpreter.py", line 343, in interpret
handlers[opcode](self, args)
File "/home/daniel/.buildout/eggs/zope.tal-3.5.2-py2.6.egg/zope/tal/talinterpreter.py", line 888, in do_useMacro
self.interpret(macro)
File "/home/daniel/.buildout/eggs/zope.tal-3.5.2-py2.6.egg/zope/tal/talinterpreter.py", line 343, in interpret
handlers[opcode](self, args)
File "/home/daniel/.buildout/eggs/zope.tal-3.5.2-py2.6.egg/zope/tal/talinterpreter.py", line 533, in do_optTag_tal
self.do_optTag(stuff)
File "/home/daniel/.buildout/eggs/zope.tal-3.5.2-py2.6.egg/zope/tal/talinterpreter.py", line 518, in do_optTag
return self.no_tag(start, program)
File "/home/daniel/.buildout/eggs/zope.tal-3.5.2-py2.6.egg/zope/tal/talinterpreter.py", line 513, in no_tag
self.interpret(program)
File "/home/daniel/.buildout/eggs/zope.tal-3.5.2-py2.6.egg/zope/tal/talinterpreter.py", line 343, in interpret
handlers[opcode](self, args)
File "/home/daniel/.buildout/eggs/zope.tal-3.5.2-py2.6.egg/zope/tal/talinterpreter.py", line 852, in do_condition
self.interpret(block)
File "/home/daniel/.buildout/eggs/zope.tal-3.5.2-py2.6.egg/zope/tal/talinterpreter.py", line 343, in interpret
handlers[opcode](self, args)
File "/home/daniel/.buildout/eggs/zope.tal-3.5.2-py2.6.egg/zope/tal/talinterpreter.py", line 742, in do_insertStructure_tal
structure = self.engine.evaluateStructure(expr)
File "/home/daniel/.buildout/eggs/Zope2-2.13.19-py2.6.egg/Products/PageTemplates/Expressions.py", line 218, in evaluateStructure
text = super(ZopeContext, self).evaluateStructure(expr)
File "/home/daniel/.buildout/eggs/zope.tales-3.5.2-py2.6.egg/zope/tales/tales.py", line 696, in evaluate
return expression(self)
File "/home/daniel/.buildout/eggs/zope.contentprovider-3.7.2-py2.6.egg/zope/contentprovider/tales.py", line 77, in __call__
provider.update()
File "/home/daniel/.buildout/eggs/zope.viewlet-3.7.2-py2.6.egg/zope/viewlet/manager.py", line 112, in update
self._updateViewlets()
File "/home/daniel/.buildout/eggs/zope.viewlet-3.7.2-py2.6.egg/zope/viewlet/manager.py", line 118, in _updateViewlets
viewlet.update()
File "/home/daniel/.buildout/eggs/plone.app.discussion-2.1.9-py2.6.egg/plone/app/discussion/browser/comments.py", line 263, in update
self.form.update()
File "/home/daniel/.buildout/eggs/plone.z3cform-0.7.8-py2.6.egg/plone/z3cform/fieldsets/extensible.py", line 59, in update
super(ExtensibleForm, self).update()
File "/home/daniel/.buildout/eggs/plone.z3cform-0.7.8-py2.6.egg/plone/z3cform/patch.py", line 30, in GroupForm_update
_original_GroupForm_update(self)
File "/home/daniel/.buildout/eggs/z3c.form-2.5.1-py2.6.egg/z3c/form/group.py", line 138, in update
self.actions.execute()
File "/home/daniel/.buildout/eggs/z3c.form-2.5.1-py2.6.egg/z3c/form/action.py", line 99, in execute
result = handler()
File "/home/daniel/.buildout/eggs/z3c.form-2.5.1-py2.6.egg/z3c/form/button.py", line 315, in __call__
return handler(self.form, self.action)
File "/home/daniel/.buildout/eggs/z3c.form-2.5.1-py2.6.egg/z3c/form/button.py", line 170, in __call__
return self.func(form, action)
File "/home/daniel/.buildout/eggs/plone.app.discussion-2.1.9-py2.6.egg/plone/app/discussion/browser/comments.py", line 232, in handleComment
comment_review_state = workflowTool.getInfoFor(comment, 'review_state')
File "/home/daniel/.buildout/eggs/Products.CMFCore-2.2.7-py2.6.egg/Products/CMFCore/WorkflowTool.py", line 263, in getInfoFor
raise WorkflowException(msg)
WorkflowException: No workflow provides '${name}' information.
我把代码放在这里。要重现错误运行setupenv.sh，然后bin/instance fg. 然后转到浏览器并使用degu.forum. 创建一个论坛文件夹，里面有一个论坛，然后放入一个论坛线程。然后尝试在论坛主题上发表评论。