The 5 most common causes of that issue are:
- 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 "https://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.
- The "Enable Callback Locking" setting is enabled. Please disable this from the Twitter Development area > Settings tab.
- Your server time is incorrect (uncommon)
Please verify #1 and #2 and go through our Twitter Application Setup Guide again.
