hi all, im following the tutorial here https://developers.ringcentral.com/guide/notifications/websockets/quick-start#ruby to create a ruby websocket. however, after running the code websockets.rb (i just copied and pasted the code from the tutorial page), i kept getting this error:
''websockets.rb:24:in `<main>': uninitialized constant WS (NameError)''
"subscription = WS.new($rc, events, lambda { |message|"
any idea why it's not recognizing WS? thanks