"no implicit conversion of Array into String"

please I just developed a game in Ruby on Rails, and I am about to deploy it. Everything works fine in the development stage but keeps on getting "ActionView::Template::Error (no implicit conversion of Array into String):" in the deployment environment. The error pointed me to a particular line of code which is,

def passcode
  JSON.parse(game.passcode)
end

This is the output of my object before the JSON.parse;

"[\"ORANGE\", \"YELLOW\", \"PURPLE\", \"GREEN\"]"

The method above output;

["ORANGE", "YELLOW", "PURPLE", "GREEN"]

The passcode was used to get the game outcome after the player won or lost the game.

def game_outcome
 if !attempts.empty? && passcode == last_attempt
  return "Congratulations!"
 elsif attempts.size == guesses.size && passcode != last_attempt
  return "Sorry, you've lost! It was a bit difficult"
 end
end

I have tried to see the output of the method on my local machine and it outputs an array, which I think it's the right thing

I will appreciate your assistance.