TraitError: Unexpected error in TraitType: default value not set properly #12
Description
Using file upload widget from
'2.7.9 (default, Dec 10 2014, 12:24:55) [MSC v.1500 32 bit (Intel)]'
IPython.version=3.1.0
traitlets.version_info=4, 0, 0, 'dev'
---------------------------------------------------------------------------
TraitError Traceback (most recent call last)
C:\Python\Python27\lib\site-packages\IPython\core\formatters.pyc in __call__(self, obj)
898 method = _safe_get_formatter_method(obj, self.print_method)
899 if method is not None:
--> 900 method()
901 return True
902
C:\Python\Python27\lib\site-packages\IPython\html\widgets\widget.pyc in _ipython_display_(self, **kwargs)
419 """Called when `IPython.display.display` is called on the widget."""
420 # Show view.
--> 421 if self._view_name is not None:
422 self._send({"method": "display"})
423 self._handle_displayed(**kwargs)
C:\Python\Python27\lib\site-packages\traitlets\traitlets.pyc in __get__(self, obj, cls)
437 # HasTraits should call set_default_value to populate
438 # this. So this should never be reached.
--> 439 raise TraitError('Unexpected error in TraitType: '
440 'default value not set properly')
441 else:
TraitError: Unexpected error in TraitType: default value not set properly