title: Validator::validateNumber does not exist
body: <p><a href="https://i.stack.imgur.com/n1OfF.png" rel="nofollow noreferrer">Image 1</a>
  <img src="https://i.stack.imgur.com/n1OfF.png"></p>
  
  <p><a href="https://i.stack.imgur.com/YxFBT.png" rel="nofollow noreferrer">Image 2</a>
  <img src="https://i.stack.imgur.com/YxFBT.png"></p>
  
  <p><a href="https://i.stack.imgur.com/5vdN3.png" rel="nofollow noreferrer">Image 3</a>
  <img src="https://i.stack.imgur.com/5vdN3.png"></p>
  
  <p>Why is post request not allowed?</p>