python bot.py gave error

[vikas12121200]

(hhsmartmirror) pi@raspberrypi:~/AI-Smart-Mirror $ python bot.pyTraceback (most recent call last):
  File "bot.py", line 12, in <module>
    from nlg import NLG
  File "/home/pi/AI-Smart-Mirror/nlg.py", line 7, in <module>
    gateway = launch_py4j_server()
  File "/home/pi/AI-Smart-Mirror/py4j_server/__init__.py", line 31, in launch_py4j_server
    stdout=PIPE, stdin=PIPE)
  File "/usr/lib/python2.7/subprocess.py", line 390, in __init__
    errread, errwrite)
  File "/usr/lib/python2.7/subprocess.py", line 1024, in _execute_child
    raise child_exception
OSError: [Errno 2] No such file or directory