Latest site upgrade not working

[david (David Taylor)]

@Aniruddh_Dubey

LoadError: cannot load such file -- single_sign_on
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.10.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:15:in `require'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.10.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:15:in `require'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/zeitwerk-2.5.4/lib/zeitwerk/kernel.rb:35:in `require'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/activesupport-6.1.4.1/lib/active_support/dependencies/zeitwerk_integration.rb:51:in `require_dependency'
/var/www/discourse/plugins/discourse-codechef-email-handler/plugin.rb:29:in `block in activate!'

Looks like an error from a third-party plugin: discourse-codechef-email-handler. It will probably need to be updated to work with the latest version of Discourse.