Adding Skill generates exception: KeyError: 'SkillScoreSystem-'

Clean Ubuntu 13.04 64 Bit build
Clean SchoolTool 2.4.0 from Software Centre
No Cando addon

Create Doucment, Layer, Doesnt appear to matter how deep your layer tree is
Work throght the tree creating SkillSets etc.
Click 'Add Skill' - generates error.
Import from XLS works ok
Post import from XLS add skill is still broken.

Traceback below

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

KeyError: 'SkillScoreSystem-'

Traceback

File "/usr/lib/python2.7/dist-packages/zope/publisher/publish.py", line 132, in publish
  result = publication.callObject(request, obj)
File "/usr/lib/python2.7/dist-packages/zope/app/publication/zopepublication.py", line 205, in callObject
  return mapply(ob, request.getPositionalArguments(), request)
File "/usr/lib/python2.7/dist-packages/zope/publisher/publish.py", line 107, in mapply
  return debug_call(obj, args)
Extra information: <schooltool.skin.flourish.zcml_content.SkillAddView_add.html object at 0x7fe89055c310>
File "/usr/lib/python2.7/dist-packages/zope/publisher/publish.py", line 113, in debug_call
  return obj(*args)
File "/usr/lib/python2.7/dist-packages/schooltool/skin/flourish/page.py", line 93, in __call__
  result = self.render(*args, **kw)
File "/usr/lib/python2.7/dist-packages/z3c/form/form.py", line 264, in render
  return super(AddForm, self).render()
File "/usr/lib/python2.7/dist-packages/z3c/form/form.py", line 159, in render
  return self.template()
File "/usr/lib/python2.7/dist-packages/zope/browserpage/viewpagetemplatefile.py", line 81, in __call__
  return self.im_func(im_self, *args, **kw)
File "/usr/lib/python2.7/dist-packages/zope/browserpage/viewpagetemplatefile.py", line 49, in __call__
  sourceAnnotations=getattr(debug_flags, 'sourceAnnotations', 0),
File "/usr/lib/python2.7/dist-packages/zope/pagetemplate/pagetemplate.py", line 132, in pt_render
  strictinsert=0, sourceAnnotations=sourceAnnotations
Template "/usr/lib/python2.7/dist-packages/schooltool/skin/flourish/templates/main.pt"
File "/usr/lib/python2.7/dist-packages/zope/pagetemplate/pagetemplate.py", line 241, in __call__
  interpreter()
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 271, in __call__
  self.interpret(self.program)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 343, in interpret
  handlers[opcode](self, args)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 533, in do_optTag_tal
  self.do_optTag(stuff)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 518, in do_optTag
  return self.no_tag(start, program)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 513, in no_tag
  self.interpret(program)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 343, in interpret
  handlers[opcode](self, args)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 742, in do_insertStructure_tal
  structure = self.engine.evaluateStructure(expr)
File "/usr/lib/python2.7/dist-packages/zope/tales/tales.py", line 696, in evaluate
  return expression(self)
Template "/usr/lib/python2.7/dist-packages/schooltool/skin/flourish/templates/main.pt", line 79, column 8
  Expression: <PathExpr standard:u'view/page_template|nothing'>
File "/usr/lib/python2.7/dist-packages/zope/tales/expressions.py", line 217, in __call__
  return self._eval(econtext)
File "/usr/lib/python2.7/dist-packages/zope/tales/expressions.py", line 211, in _eval
  return ob()
File "/usr/lib/python2.7/dist-packages/zope/browserpage/viewpagetemplatefile.py", line 81, in __call__
  return self.im_func(im_self, *args, **kw)
File "/usr/lib/python2.7/dist-packages/zope/browserpage/viewpagetemplatefile.py", line 49, in __call__
  sourceAnnotations=getattr(debug_flags, 'sourceAnnotations', 0),
File "/usr/lib/python2.7/dist-packages/zope/pagetemplate/pagetemplate.py", line 132, in pt_render
  strictinsert=0, sourceAnnotations=sourceAnnotations
Template "/usr/lib/python2.7/dist-packages/schooltool/skin/flourish/templates/page.pt"
File "/usr/lib/python2.7/dist-packages/zope/pagetemplate/pagetemplate.py", line 241, in __call__
  interpreter()
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 271, in __call__
  self.interpret(self.program)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 343, in interpret
  handlers[opcode](self, args)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 583, in do_setLocal_tal
  self.engine.setLocal(name, self.engine.evaluateValue(expr))
File "/usr/lib/python2.7/dist-packages/zope/tales/tales.py", line 696, in evaluate
  return expression(self)
Template "/usr/lib/python2.7/dist-packages/schooltool/skin/flourish/templates/page.pt", line 14, column 2
  Expression: <PathExpr standard:u'view/content_template|nothing'>
File "/usr/lib/python2.7/dist-packages/zope/tales/expressions.py", line 217, in __call__
  return self._eval(econtext)
File "/usr/lib/python2.7/dist-packages/zope/tales/expressions.py", line 211, in _eval
  return ob()
File "/usr/lib/python2.7/dist-packages/zope/browserpage/viewpagetemplatefile.py", line 81, in __call__
  return self.im_func(im_self, *args, **kw)
File "/usr/lib/python2.7/dist-packages/zope/browserpage/viewpagetemplatefile.py", line 49, in __call__
  sourceAnnotations=getattr(debug_flags, 'sourceAnnotations', 0),
File "/usr/lib/python2.7/dist-packages/zope/pagetemplate/pagetemplate.py", line 132, in pt_render
  strictinsert=0, sourceAnnotations=sourceAnnotations
Template "/usr/lib/python2.7/dist-packages/schooltool/cando/browser/templates/form.pt"
File "/usr/lib/python2.7/dist-packages/zope/pagetemplate/pagetemplate.py", line 241, in __call__
  interpreter()
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 271, in __call__
  self.interpret(self.program)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 343, in interpret
  handlers[opcode](self, args)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 888, in do_useMacro
  self.interpret(macro)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 343, in interpret
  handlers[opcode](self, args)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 858, in do_defineMacro
  self.interpret(macro)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 343, in interpret
  handlers[opcode](self, args)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 533, in do_optTag_tal
  self.do_optTag(stuff)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 518, in do_optTag
  return self.no_tag(start, program)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 513, in no_tag
  self.interpret(program)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 343, in interpret
  handlers[opcode](self, args)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 954, in do_defineSlot
  self.interpret(block)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 343, in interpret
  handlers[opcode](self, args)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 954, in do_defineSlot
  self.interpret(block)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 343, in interpret
  handlers[opcode](self, args)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 858, in do_defineMacro
  self.interpret(macro)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 343, in interpret
  handlers[opcode](self, args)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 533, in do_optTag_tal
  self.do_optTag(stuff)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 518, in do_optTag
  return self.no_tag(start, program)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 513, in no_tag
  self.interpret(program)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 343, in interpret
  handlers[opcode](self, args)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 821, in do_loop_tal
  self.interpret(block)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 343, in interpret
  handlers[opcode](self, args)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 533, in do_optTag_tal
  self.do_optTag(stuff)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 518, in do_optTag
  return self.no_tag(start, program)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 513, in no_tag
  self.interpret(program)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 343, in interpret
  handlers[opcode](self, args)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 852, in do_condition
  self.interpret(block)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 343, in interpret
  handlers[opcode](self, args)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 858, in do_defineMacro
  self.interpret(macro)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 343, in interpret
  handlers[opcode](self, args)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 533, in do_optTag_tal
  self.do_optTag(stuff)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 518, in do_optTag
  return self.no_tag(start, program)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 513, in no_tag
  self.interpret(program)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 343, in interpret
  handlers[opcode](self, args)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 742, in do_insertStructure_tal
  structure = self.engine.evaluateStructure(expr)
File "/usr/lib/python2.7/dist-packages/zope/tales/tales.py", line 696, in evaluate
  return expression(self)
Template "/usr/lib/python2.7/dist-packages/schooltool/skin/flourish/templates/z3c-schooltool-form.pt", line 80, column 18
  Expression: <PathExpr standard:u'widget/render'>
File "/usr/lib/python2.7/dist-packages/zope/tales/expressions.py", line 217, in __call__
  return self._eval(econtext)
File "/usr/lib/python2.7/dist-packages/zope/tales/expressions.py", line 211, in _eval
  return ob()
File "/usr/lib/python2.7/dist-packages/z3c/form/widget.py", line 151, in render
  return template(self)
File "/usr/lib/python2.7/dist-packages/zope/browserpage/viewpagetemplatefile.py", line 49, in __call__
  sourceAnnotations=getattr(debug_flags, 'sourceAnnotations', 0),
File "/usr/lib/python2.7/dist-packages/zope/pagetemplate/pagetemplate.py", line 132, in pt_render
  strictinsert=0, sourceAnnotations=sourceAnnotations
Template "/usr/lib/python2.7/dist-packages/z3c/form/browser/select_input.pt"
File "/usr/lib/python2.7/dist-packages/zope/pagetemplate/pagetemplate.py", line 241, in __call__
  interpreter()
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 271, in __call__
  self.interpret(self.program)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 343, in interpret
  handlers[opcode](self, args)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 531, in do_optTag_tal
  self.no_tag(stuff[-2], stuff[-1])
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 513, in no_tag
  self.interpret(program)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 343, in interpret
  handlers[opcode](self, args)
File "/usr/lib/python2.7/dist-packages/zope/tal/talinterpreter.py", line 819, in do_loop_tal
  iterator = self.engine.setRepeat(name, expr)
File "/usr/lib/python2.7/dist-packages/zope/tales/tales.py", line 682, in setRepeat
  expr = self.evaluate(expr)
File "/usr/lib/python2.7/dist-packages/zope/tales/tales.py", line 696, in evaluate
  return expression(self)
Template "/usr/lib/python2.7/dist-packages/z3c/form/browser/select_input.pt", line 28, column 0
  Expression: <PathExpr standard:u'view/items'>
File "/usr/lib/python2.7/dist-packages/zope/tales/expressions.py", line 217, in __call__
  return self._eval(econtext)
File "/usr/lib/python2.7/dist-packages/zope/tales/expressions.py", line 211, in _eval
  return ob()
File "/usr/lib/python2.7/dist-packages/z3c/form/browser/select.py", line 85, in items
  addItem(idx, term)
File "/usr/lib/python2.7/dist-packages/z3c/form/browser/select.py", line 74, in addItem
  ignored.remove(term.token)