'th' is not an internal or external command, nor is it a runnable program or batch file.

I'm running the code in Windows10 with Python2.7(Anaconda2), and I met the above problem.
 
It seems that this problem originates from a line in formants.py: 
     easy_call("th load_estimation_model.lua " + tmp_features_filename + ' ' + preds_filename)

How can I solve this problem? @Shuadissen 