running in google colab.

[ghost]

---

NameError Traceback (most recent call last)
in ()
19 # main(args)
20 #else:
---> 21 main(args)

in main(args)
11 """
12
---> 13 sess_path = utils.create_session(args.log_dir, args.session_id) # Create a session path based on the session id.
14 G = tf.Graph()
15 with G.as_default():

/content/drive/My Drive/Colab_Notebooks/crowd_counting_tensorflow-master/src/utils.py in create_session(log_dir, session_id)
121 folder_path = os.path.join(log_dir, 'session:'+str(session_id))
122 if os.path.exists(folder_path):
--> 123 print ('Session already taken. Please select a different session id.')
124 sys.exit()
125 else:

NameError: name 'logdir' is not defined

[ghost]

This is an error I am getting on running the code. Could you please help? I am new