The errors are observed when the file’s formatting is incorrect, When your subtitle file has sections in which the start time is defined as greater than the end time of any line then the validator throws this error. This website (third-party, not owned by us) is an example online VTT validator. https://w3c.github.io/webvtt.js/parser.html. You can use this to find the VTT file errors and correct them.
If the issue is still observed then, please share the subtitle files with us at support@vdocipher.com, our team will check and update you with the error details of these files and the required corrections.
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