Hi. This was the error message:
Error Details
=============
An error of type E_ERROR was caused in line 177 of the file /home/themer27/public_html/wp-content/plugins/web-stories/includes/Admin/Cross_Origin_Isolation.php. Error message: Uncaught ArgumentCountError: Too few arguments to function Google\Web_Stories\Admin\Cross_Origin_Isolation::get_avatar(), 4 passed in /home/themer27/public_html/wp-includes/class-wp-hook.php on line 308 and exactly 6 expected in /home/themer27/public_html/wp-content/plugins/web-stories/includes/Admin/Cross_Origin_Isolation.php:177
Stack trace:
#0 /home/themer27/public_html/wp-includes/class-wp-hook.php(308): Google\Web_Stories\Admin\Cross_Origin_Isolation->get_avatar(‘