autopkg error

gistfile1.txt

autopkg version 
0.4.2

autopkg run -v Firefox.munki
Traceback (most recent call last):
  File "/usr/local/bin/autopkg", line 1469, in <module>
    sys.exit(main(sys.argv))
  File "/usr/local/bin/autopkg", line 1463, in main
    exit(subcommands[verb]['function'](argv))
  File "/usr/local/bin/autopkg", line 1249, in run_recipes
    options.postprocessors)
  File "/usr/local/bin/autopkg", line 214, in load_recipe
    name, override_dirs + recipe_dirs)
  File "/Library/AutoPkg/autopkglib/__init__.py", line 138, in find_recipe_by_identifier
    if get_identifer_from_recipe_file(match) == identifier:
  File "/Library/AutoPkg/autopkglib/__init__.py", line 121, in get_identifer_from_recipe_file
    "WARNING: plist error for %s: %s" % (filename, unicode(err)))
UnicodeEncodeError: 'ascii' codec can't encode character u'\u2019' in position 153: ordinal not in range(128)