crash creating DB

trytond -c /etc/trytond.conf -d bryants --all
Traceback (most recent call last):
  File "/usr/local/bin/trytond", line 80, in <module>
    server.TrytonServer(options).run()
  File "/usr/local/lib/python2.7/dist-packages/trytond/server.py", line 109, in run
    Pool(db_name).init(update=self.options.update, lang=lang)
  File "/usr/local/lib/python2.7/dist-packages/trytond/pool.py", line 144, in init
    self.start()
  File "/usr/local/lib/python2.7/dist-packages/trytond/pool.py", line 97, in start
    register_classes()
  File "/usr/local/lib/python2.7/dist-packages/trytond/modules/__init__.py", line 355, in register_classes
    mod_file, pathname, description)
  File "/usr/local/lib/python2.7/dist-packages/trytond/modules/currency/__init__.py", line 5, in <module>
    from .currency import *
  File "/usr/local/lib/python2.7/dist-packages/trytond/modules/currency/currency.py", line 6, in <module>
    from trytond.tools import safe_eval, datetime_strftime
ImportError: cannot import name safe_eval