error when posting to /chat.html in ruby server

[gulkily]

[2024-09-27 01:52:46] ERROR NameError: uninitialized constant CustomHTTPServer::Shellwords
	template/ruby/start_server.rb:196:in `block (2 levels) in run_script'
	template/ruby/start_server.rb:196:in `map'
	template/ruby/start_server.rb:196:in `block in run_script'
	template/ruby/start_server.rb:191:in `each'
	template/ruby/start_server.rb:191:in `run_script'
	template/ruby/start_server.rb:91:in `handle_chat_post'
	template/ruby/start_server.rb:43:in `do_POST'
	/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/webrick/httpservlet/abstract.rb:105:in `service'
	/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/webrick/httpserver.rb:140:in `service'
	/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/webrick/httpserver.rb:96:in `run'
	/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/webrick/server.rb:307:in `block in start_thread'