What does 2 Chronicles 26:18 mean?

They told him, 'Uzziah, you have no right to burn incense to the Lord. That’s the job of the priests, the descendants of Aaron, who have been set apart for this. Leave the sanctuary, because you’ve done wrong, and God won’t honor you for it.' 2 Chronicles 26:18 - Modern Text Bible

(The priests reminded Uzziah of God’s rules and warned him that his actions would not be blessed.)