this parameter cannot be zero when i using my file history.npz

[WiNE-iNEFF]

I have dataset history.txt and i use this code for encoding
PYTHONPATH=src ./encode.py history.txt history.npz PYTHONPATH=src ./train.py --dataset history.npz
But when i start fonetune i have a problem "this parameter cannot be zero". When i use history.txt, this problen don't exist