Twitter widget not working? try this solution..
If you’re using our themes and find out Twitter widget stop working, that because Twitter retired their API version 1.0 and updated to API version 1.1, many themes developer that include previous simpler API v1.0 to get tweets timeline or feed will face the same issues as i am.
The new twitter api v1.1 will required authentication with your twitter account developer api. Luckily i found an article that suite us best on using twitter new api v1.1 in WordPress.
Check this WordPress Tutorial on How to use new Twitter API 1.1 in WordPress.