title: Unable to clone a private repo from github
body: <p>I am following this tutorial - <a href="https://github.com/tradingview/charting-library-tutorial/blob/master/documentation/home.md" rel="nofollow noreferrer">link</a></p>
  <p>In this, you need access to a private repo called <code>charting_library</code>, which I do.</p>
  <p>As written in the documentation,  <code>The Charting Library is free, but its code is in the private repository on GitHub. Make sure that you have access to this repository: https://github.com/tradingview/charting_library/.</code> I don't see any error but I can see the code here.</p>
  <p>So following the documentation, when I run this</p>
  <pre><code>git clone https://github.com/tradingview/charting-library-tutorial.git
  </code></pre>
  <p>The repo gets cloned, no problem. But then when I run the next command</p>
  <pre><code>git submodule update --init --recursive
  </code></pre>
  <p>I get the following error</p>
  <pre><code>Cloning into 'C:/coding/charting-library-tutorial/charting_library_clonned_data'...
  Host key verification failed.
  fatal: Could not read from remote repository.
  
  Please make sure you have the correct access rights
  and the repository exists.
  fatal: clone of 'git@github.com:tradingview/charting_library.git' into submodule path 'C:/coding/charting-library-tutorial/charting_library_clonned_data' failed
  Failed to clone 'charting_library_clonned_data'. Retry scheduled
  Cloning into 'C:/coding/charting-library-tutorial/charting_library_clonned_data'...
  Host key verification failed.
  fatal: Could not read from remote repository.
  
  Please make sure you have the correct access rights
  and the repository exists.
  fatal: clone of 'git@github.com:tradingview/charting_library.git' into submodule path 'C:/coding/charting-library-tutorial/charting_library_clonned_data' failed
  Failed to clone 'charting_library_clonned_data' a second time, aborting
  </code></pre>
  <p>What am I doing wrong here?</p>