The following are the main reasons that this error usually occurs:
* Your Twitter Application wasn't set up properly. As of 6/2018, Twitter has made a chance to their app settings for "Callback URL". The URL should be your website followed by index.php, like "
yoursite.com/index.php"
* You didn't copy the API Key and Secret properly to JFBConnect
* Your Twitter API and Secret Keys may need to be regenerated in your Twitter application. This may be done inside the Twitter Development area for your app.
* Your server time is incorrect (uncommon)
Since you said you've created a new app, please doublecheck the callback URL with our
Twitter Application Setup Guide
-Melissa