Training the belief tracker:**NameError: name 'self' is not defined**

[Amartya]

I am training the belief tracker. I am getting the error in the very last stage of training:

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Finishing 202 dialog in epoch 1
Finishing 203 dialog in epoch 1
Epoch 1, Alpha 0.002000, TRAIN entropy:95.17, Time:14.06 mins,
VALID entropy:74.52
saving net to file ...
Traceback (most recent call last):
File "nndial.py", line 22, in
model.trainNet()
File "C:\Users\MY DELL\Desktop\Course\6th sem\UGP\data\NNDIAL-master\nn\NNDialogue.py", line 590, in trainNet
self.saveNet()
File "C:\Users\MY DELL\Desktop\Course\6th sem\UGP\data\NNDIAL-master\nn\NNDialogue.py", line 999, in saveNet
'file' :dict( [(name,eval(name)) for name in self.file_vars]),
File "C:\Users\MY DELL\Desktop\Course\6th sem\UGP\data\NNDIAL-master\nn\NNDialogue.py", line 999, in
'file' :dict( [(name,eval(name)) for name in self.file_vars]),
File "", line 1, in
NameError: name 'self' is not defined

I am not able to understand why this error is coming

Could anyone please help with this. I would be really grateful. Thanks