Updated Plugin And Now Receiving Errors On Top Of Website

[Moderator Note: Topic title amended. Your problem is no more urgent than anyone else’s.]

I updated my plugin on my website last night and now I see this error at the top of my page:

Warning: array_slice() expects parameter 1 to be array, boolean given in /home2/seavaad/public_html/wp-content/plugins/my-twitter-widget/widget.php on line 164

Warning: key() [function.key]: Passed variable is not an array or object in /home2/seavaad/public_html/wp-content/plugins/my-twitter-widget/widget.php on line 164

Domain name: seattlevad.org

I deactivated the plugin and the error was still there. I deleted the files and the error is still there. How do I fix this? It’s urgent I fix it immediately. Thank you.

https://wordpress.org/plugins/my-twitter-widget/