nilmtk: Inquiry for error in REDD conversion process

Hi, I have installed Anaconda (Python 2.7.8) and git client on Windows 7 (Home Premium) following the instructions in its documentation and all the process passed successfully. I would like to get analyzed of REDD data set. However, when I started to convert REDD data, after the conversion of the 6th house finished, it turned error as

    Loading house 6... 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 

    Traceback (most recent call last):
     File "<pyshell#2>", line 1, in <module>
     convert_redd('C:/Users/bundit/Desktop/REDD/low_freq','C:/Users/bundit/Desktop/redd.h5')
     File "C:\Users\bundit\Anaconda\lib\site-packages\nilmtk-0.2.0.dev-        py2.7.egg\nilmtk\dataset_converters\redd\convert_redd.py", line 57, in convert_redd hdf_filename)
     File "c:\users\bundit\nilm_metadata\nilm_metadata\convert_yaml_to_hdf5.py", line 30, in   convert_yaml_to_hdf5
     assert isdir(yaml_dir)
     AssertionError 

After check if the module get_module_directory exists, it turned out error as:

   >>> from nilmtk.utils import get_module_directory

  Traceback (most recent call last):
   File "<pyshell#2>", line 1, in <module>
   from nilmtk.utils import get_module_directory
   ImportError: cannot import name get_module_directory

   >>> print get_module_directory()

  Traceback (most recent call last):
   File "<pyshell#3>", line 1, in <module>
   print get_module_directory()
   NameError: name 'get_module_directory' is not defined

The nilmtk module already exists in the system (No error when running >>> import nilmtk)

So, can anyone point out for cause of the error that prevent completion of the data conversion process?

Thanks. Bundit