Alphabet cannot encode transcript

Hey,
I was trying to train my own model with English data set .
(50 GB from common voice)
but after first epoch I’ve got following error:

Alphabet cannot encode transcript “” while processing sample “…/DataBase/en/clips/common_voice_en_1655Preformatted text6180.wav”, check that your alphabet contains all characters in the training corpus. Missing characters are: [].

does anybody knows why it happened?

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I downloaded 50GB dataBase from common voice and I was trying to train it with this guid but i’ve got the error that i mentioned in first comment.

The import script is not perfect, follow the guidelines and search before you post:

Im getting the same error. I followed the steps given in Training 0.9.1 and when I run the command python3 DeepSpeech.py --train_files ../data/CV/en/clips/train.csv --dev_files ../data/CV/en/clips/dev.csv --test_files ../data/CV/en/clips/test.csv

ValueError: Alphabet cannot encode transcript “it’s true then” while processing sample “/mnt/d/Sundar/DeepSpeechDataSet/cv-corpus-5.1-2020-06-22/en/clips/common_voice_en_22311413.wav”, check that your alphabet contains all characters in the training corpus. Missing characters are: [’’’].

Please let me know how to resolve this issue.

Even am also getting the same error.can any one help me to get out of this.

ValueError: Alphabet cannot encode transcript “course 1 and course 2 mass been different” while processing sample “audio/Train/3770_2.wav”, check that your alphabet contains all characters in the training corpus. Missing characters are: [‘1’, ‘2’].