title: auth0 cannot read poperty options of undefined
body: <p>I try to get auth0 running on a simple react app.</p>
  
  <p>I create a auth0 object with the folling parameter:</p>
  
  <pre><code>this.auth0 = new auth0.WebAuth({
          domain: AUTH_CONFIG.domain,
          clientID: AUTH_CONFIG.clientId,
          redirectUri: AUTH_CONFIG.redirectUri,
          audience: `https://${AUTH_CONFIG.domain}/userinfo`,
          responseType: AUTH_CONFIG.responseType,
          scope: AUTH_CONFIG.scope,
      });
  </code></pre>
  
  <p>after I logg in on the Auth0 website and get redirected to my callback url I get the error </p>
  
  <blockquote>
    <p>cannot read poperty of undefined</p>
  </blockquote>
  
  <p>I just cant figer out where this error located.</p>
  
  <p>In my Applcation in auth0 i configured: Allowed Callback URLs: <em><a href="http://localhost:3000/callback" rel="nofollow noreferrer">http://localhost:3000/callback</a></em></p>