pydub error

doit()
---------------------------------------------------------------------------
WindowsError                              Traceback (most recent call last)
<ipython-input-5-e145d4b943d3> in <module>()
----> 1 doit()

<ipython-input-4-c0e1f54adbd6> in doit()
      7 # g.es(r"d:\Dropbox\MY LEO FILES\LEO FILES\I_Programming\FILES\SCRIPTS\balabolka_console\0WavOut.wav")
      8 #os.startfile(os.path.join(c.openDirectory,r"FILES\SCRIPTS\balabolka_console")+r'\0WavOut.wav')
----> 9     wav.export(r"d:\Dropbox\MY LEO FILES\LEO FILES\I_Programming\FILES\SCRIPTS\balabolka_console\5WavOut.mp3",format="mp3")
     10

c:\python27\lib\site-packages\pydub-0.8.3-py2.7.egg\pydub\audio_segment.pyc in export(self, out_f, format, codec, bitrate, parameters, tags, id3v2_version)
    360         subprocess.call(convertion_command,
    361                         # make converter shut up
--> 362                         stderr=open(os.devnull)
    363                         )
    364

c:\python27\lib\subprocess.pyc in call(*popenargs, **kwargs)
    522     retcode = call(["ls", "-l"])
    523     """
--> 524     return Popen(*popenargs, **kwargs).wait()
    525
    526

c:\python27\lib\subprocess.pyc in __init__(self, args, bufsize, executable, stdin, stdout, stderr, preexec_fn, close_fds, shell, cwd, env, universal_newlines, startupinfo, creationflags)
    709                                 p2cread, p2cwrite,
    710                                 c2pread, c2pwrite,
--> 711                                 errread, errwrite)
    712         except Exception:
    713             # Preserve original exception in case os.close raises.

c:\python27\lib\subprocess.pyc in _execute_child(self, args, executable, preexec_fn, close_fds, cwd, env, universal_newlines, startupinfo, creationflags, shell, p2cread, p2cwrite, c2pread, c2pwrite, errread, errwrite)
    946                                          env,
    947                                          cwd,
--> 948                                          startupinfo)
    949             except pywintypes.error, e:
    950                 # Translate pywintypes.error to WindowsError, which is

WindowsError: [Error 2] The system cannot find the file specified