Twitter has updated their API to version 1.1. What does this mean? Well it means that twitter apps now need authorization. Secret stuff to make them function properly.
Here is what you will need to do to get your access tokens so can can continue to display your profound & engaging tweets on your website.
1- Point your browser https://dev.twitter.com/apps and login with your twitter credentials
2- Create new application
3- Fill in the form fields and create your app
4- On the application page, click the “Create my access token”.
That’s it – easy! Oh, and don’t forget to update your theme.