Problem with nat_config.pkl ??

[dustinaevans]

ryu-manager base.py l2switch.py snat.py --verbose
loading app base.py
loading app l2switch.py
loading app snat.py
loading app ryu.controller.ofp_handler
creating context wsgi
instantiating app base.py of Base
instantiating app l2switch.py of L2Switch
instantiating app snat.py of SNAT
Failed when loading pickled

nat_config.pkl.txt