Įkeliant šią užrašinę įvyko klaida. Įsitikinkite, kad failas pasiekiamas, ir bandykite dar kartą.

Įsitikinkite, kad turite leidimą peržiūrėti šią užrašinę sistemoje „GitHub“, ir suteikite „Colab“ prieigos teisę naudoti „GitHub“ API.

https://github.com/flutter/codelabs/blob/master/tfrs-flutter/step1/backend/ranking/ranking.ipynb 
Fetch for https://api.github.com/repos/flutter/codelabs/contents/tfrs-flutter/step1/backend/ranking?per_page=100&ref=master failed: {"message":"No commit found for the ref master","documentation_url":"https://docs.github.com/v3/repos/contents/","status":"404"}
CustomError: Fetch for https://api.github.com/repos/flutter/codelabs/contents/tfrs-flutter/step1/backend/ranking?per_page=100&ref=master failed: {"message":"No commit found for the ref master","documentation_url":"https://docs.github.com/v3/repos/contents/","status":"404"}
    at new QM (https://ssl.gstatic.com/colaboratory-static/common/7fc29bba543ede9ff48d2aea9bb633da/external_binary_l10n__lt.js:2494:68)
    at wa.program_ (https://ssl.gstatic.com/colaboratory-static/common/7fc29bba543ede9ff48d2aea9bb633da/external_binary_l10n__lt.js:2477:436)
    at za (https://ssl.gstatic.com/colaboratory-static/common/7fc29bba543ede9ff48d2aea9bb633da/external_binary_l10n__lt.js:16:57)
    at wa.next_ (https://ssl.gstatic.com/colaboratory-static/common/7fc29bba543ede9ff48d2aea9bb633da/external_binary_l10n__lt.js:14:195)
    at kaa.next (https://ssl.gstatic.com/colaboratory-static/common/7fc29bba543ede9ff48d2aea9bb633da/external_binary_l10n__lt.js:17:48)
    at b (https://ssl.gstatic.com/colaboratory-static/common/7fc29bba543ede9ff48d2aea9bb633da/external_binary_l10n__lt.js:17:309)
 Suteikti „GitHub“ prieigos teisę