What does 2 Chronicles 21:12 mean?

Then Jehoram got a letter from Elijah the prophet. It said, 'This is what the Lord, the God of your ancestor David, says: You haven't lived like your father Jehoshaphat or King Asa of Judah, but like the kings of Israel.' 2 Chronicles 21:12 - Modern Text Bible

(Elijah, a prophet from the north, sends Jehoram a warning from God, calling out his failure to follow the good examples of his ancestors.)