Fatal Error

Hello, I just updated to the new WordPress version and now I am getting a “fatal error.” It appears that it might be my theme that is screwing it up, as it contains “Arras” in the error line. I would try disabling the theme but I can’t even log into the dashboard.

Fatal error: Call to undefined method Arras_Widget_Tag_Cloud::WP_Widget_Tag_Cloud() in /home/content/78/7334878/html/wp-content/themes/arras/library/widgets.php on line 404

I have no idea what to do. I would appreciate any help.

Thank you and happy 4th!