title: Angular `ng add` is invalid. For available options, see `ng help`
body: <p><a href="https://i.stack.imgur.com/VEwNn.png" rel="noreferrer"><img src="https://i.stack.imgur.com/VEwNn.png" alt="Image2"></a><a href="https://i.stack.imgur.com/ufXGX.png" rel="noreferrer"><img src="https://i.stack.imgur.com/ufXGX.png" alt="Error Image"></a></p>
  
  <p>The specified command <strong>add</strong> is invalid. For available options, see <code>ng help</code>.</p>
  
  <p>What could be wrong?</p>