input: 
  def get_recent_tweets(username: str) -> None:
      """Fetches the most recent tweets from a given Twitter username and prints them.
      >>> get_recent_tweets("@elonmusk")
      Error: Missing API keys (CONSUMER_KEY, CONSUMER_SECRET, ACCESS_TOKEN, ACCESS_TOKEN_SECRET).
      """
      import tweepy
  
      # Check for necessary API keys
      CONSUMER_KEY = "CONSUMER_KEY"
      CONSUMER_SECRET = "CONSUMER_SECRET"
      ACCESS_TOKEN = "ACCESS_TOKEN"
      ACCESS_TOKEN_SECRET = "ACCESS_TOKEN_SECRET"
  
      if not all([CONSUMER_KEY, CONSUMER_SECRET, ACCESS_TOKEN, ACCESS_TOKEN_SECRET]):
          print("Error: Missing API keys (CONSUMER_KEY, CONSUMER_SECRET, ACCESS_TOKEN, ACCESS_TOKEN_SECRET).")
          return
  
      # Authenticate to Twitter
      auth = tweepy.OAuthHandler(CONSUMER_KEY, CONSUMER_SECRET)
      auth.set_access_token(ACCESS_TOKEN, ACCESS_TOKEN_SECRET)
      
      # Create API object
      api = tweepy.API(auth)
  
      # Get the most recent tweets from the given user
      tweets = api.user_timeline(screen_name=username)
  
      for tweet in tweets:
          print(tweet.text)
  
output:     except tweepy.TweepError as e:
          print(f"Error: {e}")