Hi @Kripa,
Nice seeing you back in the Quick Community! I can definitely understand your frustration with the error, as many people encounter it with many different problems, but it does not make it clear. In the post you linked here, I saw you did not use the in() wrapper like the solution did for your condition, so I would definitely recommend trying that to see if it works.
If not, I would definitely check out this post, as it provides guidance on how to set up values with multiple fields.
Let me know if this helps!