Login lockout

[ Moderator note: title adjusted, please refrain from using help, urgent, emergency, asap, etc. in topic titles. ]

I recently changed the registration page on my site to Better User Shortcodes registration. Now I get the message “Fatal error: Internal Zend error – Missing class information for in /home/content/90/5791690/html/C3/wp-content/plugins/better-user-shortcodes/classes/config.php on line 12” when I try to log in as administrator. SO, I’m totally locked out of the website to make any changes or carrections. The site is https://communitycaringconnection.org.