Clicking on a student an selecting "score" creates exception in cando gradebook

[Jeffrey Elkner]

I was here:

https://schooltool.gctaa.net/schoolyears/Summer2012/summer2012/sections/1/skills/01-0/gradebook/cenglund

I clicked on the student and selected Score, and saw this:

Server Error

An internal server error has occurred. This most likely means that you have found a bug in SchoolTool. Please report it on the issue tracker.
Exception

ConstraintNotSatisfied: Use a unix command line interface (CLI) to manage files and
    directories. (4)

Traceback

File "/opt/summer2012/schooltool.pyquiz/eggs/zope.publisher-3.12.6-py2.6.egg/zope/publisher/publish.py", line 132, in publish
  result = publication.callObject(request, obj)
File "/opt/summer2012/schooltool.pyquiz/eggs/zope.app.publication-3.13.2-py2.6.egg/zope/app/publication/zopepublication.py", line 207, in callObject
  return mapply(ob, request.getPositionalArguments(), request)
File "/opt/summer2012/schooltool.pyquiz/eggs/zope.publisher-3.12.6-py2.6.egg/zope/publisher/publish.py", line 107, in mapply
  return debug_call(obj, args)
Extra information: <schooltool.skin.flourish.zcml_content.FlourishGradeStudent_index.html object at 0x1d8b8bd0>
File "/opt/summer2012/schooltool.pyquiz/eggs/zope.publisher-3.12.6-py2.6.egg/zope/publisher/publish.py", line 113, in debug_call
  return obj(*args)
File "/opt/summer2012/schooltool/src/schooltool/skin/flourish/page.py", line 77, in __call__
  self.update()
File "/opt/summer2012/schooltool.gradebook/src/schooltool/gradebook/browser/gradebook.py", line 1667, in update
  required=False)
File "/opt/summer2012/schooltool.pyquiz/eggs/zope.schema-3.7.1-py2.6.egg/zope/schema/_bootstrapfields.py", line 293, in __init__
  super(Text, self).__init__(*args, **kw)
File "/opt/summer2012/schooltool.pyquiz/eggs/zope.schema-3.7.1-py2.6.egg/zope/schema/_bootstrapfields.py", line 274, in __init__
  super(MinMaxLen, self).__init__(**kw)
File "/opt/summer2012/schooltool.pyquiz/eggs/zope.schema-3.7.1-py2.6.egg/zope/schema/_bootstrapfields.py", line 123, in __init__
  self.title = title
File "/opt/summer2012/schooltool.pyquiz/eggs/zope.schema-3.7.1-py2.6.egg/zope/schema/fieldproperty.py", line 52, in __set__
  field.validate(value)
File "/opt/summer2012/schooltool.pyquiz/eggs/zope.schema-3.7.1-py2.6.egg/zope/schema/_bootstrapfields.py", line 153, in validate
  self._validate(value)
File "/opt/summer2012/schooltool.pyquiz/eggs/zope.schema-3.7.1-py2.6.egg/zope/schema/_bootstrapfields.py", line 277, in _validate
  super(MinMaxLen, self)._validate(value)
File "/opt/summer2012/schooltool.pyquiz/eggs/zope.schema-3.7.1-py2.6.egg/zope/schema/_bootstrapfields.py", line 183, in _validate
  raise ConstraintNotSatisfied(value)