This might pertain to a sequence of leading dashes or dots in some
row. This can happen when Tesseract marked a number of characters as a
leader sequence but further checks have shown that it's not the case.
It's not a unrecoverable error, as I see, but just a diagnostic
message. Also such errors can happen when an image containing non-text
information is fed to Tesseract; in this case all kinds of errors can
arise.
Warm regards,
Dmitri Silaev
www.CustomOCR.com
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