Hello,

I'm trying to finetune the end.traineddata model as the steps in the link: 
https://github.com/tesseract-ocr/tesseract/wiki/TrainingTesseract-4.00#fine-tuning-for-%C2%B1-a-few-characters

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

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

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.


<https://lh3.googleusercontent.com/-Wjai0vTloSw/WYwaRTe-wHI/AAAAAAAAABA/y-k4luLbaNws3Qz5gae8oT2ou2nJoF9XACLcBGAs/s1600/2017-08-10%2B16-15-28%25E5%25B1%258F%25E5%25B9%2595%25E6%2588%25AA%25E5%259B%25BE.png>

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