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https://github.com/kvignesh1420/io/blob/kafka-nb/docs/tutorials/kafka.ipynb 
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CustomError: Fetch for https://api.github.com/repos/kvignesh1420/io/contents/docs/tutorials?per_page=100&ref=kafka-nb failed: {"message":"No commit found for the ref kafka-nb","documentation_url":"https://docs.github.com/v3/repos/contents/","status":"404"}
    at new ZL (https://ssl.gstatic.com/colaboratory-static/common/0b1e1d33f4af18a2c1f2760b1379e93a/external_binary.js:2617:68)
    at sa.program_ (https://ssl.gstatic.com/colaboratory-static/common/0b1e1d33f4af18a2c1f2760b1379e93a/external_binary.js:2600:436)
    at ta (https://ssl.gstatic.com/colaboratory-static/common/0b1e1d33f4af18a2c1f2760b1379e93a/external_binary.js:17:57)
    at sa.next_ (https://ssl.gstatic.com/colaboratory-static/common/0b1e1d33f4af18a2c1f2760b1379e93a/external_binary.js:15:196)
    at oaa.next (https://ssl.gstatic.com/colaboratory-static/common/0b1e1d33f4af18a2c1f2760b1379e93a/external_binary.js:18:48)
    at b (https://ssl.gstatic.com/colaboratory-static/common/0b1e1d33f4af18a2c1f2760b1379e93a/external_binary.js:18:309)
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