ImportError

$ Naomi 
************************************************************
*                    Naomi Assistant                       *
* Made by the Naomi Community, based on the Jasper Project *
* Source code available from                               *
*    https://github.com/NaomiProject/Naomi                 *
************************************************************
ERROR:naomi.vocabcompiler:Fatal compilation error occured: global name 'cmuclmtk' is not defined
Traceback (most recent call last):
  File "/nix/store/k21zp00maphkaxcqrr4a2yx67zzi35kp-naomi/bin/.Naomi-wrapped", line 12, in <module>
    sys.exit(main())
  File "/nix/store/k21zp00maphkaxcqrr4a2yx67zzi35kp-naomi/lib/python2.7/site-packages/naomi/__main__.py", line 62, in main
    repopulate=p_args.repopulate
  File "/nix/store/k21zp00maphkaxcqrr4a2yx67zzi35kp-naomi/lib/python2.7/site-packages/naomi/application.py", line 244, in __init__
    self.config)
  File "/nix/store/k21zp00maphkaxcqrr4a2yx67zzi35kp-naomi/lib/python2.7/site-packages/plugins/stt/pocketsphinx-stt/sphinxplugin.py", line 44, in __init__
    sphinxvocab.compile_vocabulary)
  File "/nix/store/k21zp00maphkaxcqrr4a2yx67zzi35kp-naomi/lib/python2.7/site-packages/naomi/plugin.py", line 82, in compile_vocabulary
    self.profile, compilation_func, self._vocabulary_phrases)
  File "/nix/store/k21zp00maphkaxcqrr4a2yx67zzi35kp-naomi/lib/python2.7/site-packages/naomi/vocabcompiler.py", line 157, in compile
    raise e
NameError: global name 'cmuclmtk' is not defined