What does Jeremiah 28:1 mean?

That same year, early in the reign of Zedekiah king of Judah, Hananiah son of Azzur, a prophet from Gibeon, spoke to me in the Lord's temple while the priests and all the people were there. He said: Jeremiah 28:1 - Modern Text Bible

(This sets the scene: Hananiah, a prophet, publicly confronts Jeremiah in the temple, with everyone watching.)