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My replay to my question: the tbw file was saved incorrectly from the githab via web interface and it added some lines of html page to tableau xml.
That caused this error.
Hope it will help to others
Perfect! This just happened to me (using Bitbucket), and your response got me through it in no time at all. I had right-clicked on the file name in the file explorer web interface and saved it from there. But that only saved the web page, not the content. To fix it, all I had to do was click through to the file itself and download it from there. Thanks!