
Traceback (most recent call last):

 "/private/var/folders/tt/k11390b92vl_dygt4m0s7gjsb_844d/T/pip-build-ma0rr8_8/xonsh/xonsh/parsers/base.py", line 6, in <module>
from ply import yacc
ImportError: No module named 'ply'
Traceback (most recent call last):

 "/Users/jonathanwilliamson/Dropbox (Personal)/blenderDev/addons/cgCookie/scripts/addons/retopoflow/modaloperator.py", line 171, in draw_callback_postpixel
self.handle_exception()

 "/Users/jonathanwilliamson/blender-dev/blender-master/build_darwin/bin/blender.app/Contents/MacOS/./../Resources/2.77/scripts/modules/bpy_types.py", line 590, in __getattribute__
properties = StructRNA.path_resolve(self, "properties")ReferenceError: StructRNA of type CGC_Contours has been removed