I'm trying to finetune the end.traineddata model as the steps in the link: 

As the tutorail shows, I fine tuning for ± a few characters following the 

But when I execute the first command, to generate new training and eval 

training/tesstrain.sh --fonts_dir /usr/share/fonts --lang eng --linedata_only \
  --noextract_font_properties --langdata_dir ../langdata \
  --tessdata_dir ./tessdata --output_dir ~/tesstutorial/trainplusminus

An error is prompted: *Creation of encoded unicharset failed! *While 
constructing LSTM training data.

More details refer to the image.

Can you help me? Thanks.


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