title: Facebook error "App not setup:still in development mode"
body: <p>I know there are quite a few questions already asked in regards to this, but I couldn't find one that answers my current question exactly.</p>
  <p>Actually 2 days ago,my app is perfectly running for Facebook login and registration .but now it shows below error .</p>
  <p><a href="https://i.stack.imgur.com/gQ2Fs.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/gQ2Fs.png" alt="facebook error" /></a></p>
  <p>i have done all the required steps and it was running perfectly.</p>