The code returns the following error:

Your project's URL and Key are required to create a Supabase client!  
  
Check your Supabase project's API settings to find these values  
  
https://supabase.com/dashboard/project/_/settings/api  
  
  at Ue (@supabase/ssr)  
  at updateSession (/lib/supabase/proxy)  
  at Object.middleware [as handler] (/middleware)  

Revise the code to address the error.

I was previewing: /