This Bible contradiction is from the Skeptic's Annotated Bible.
Jeconiah had no sons.
Jeremiah 22:28-30 View context
[Is] this man Coniah a despised broken idol? [is he] a vessel wherein [is] no pleasure? wherefore are they cast out, he and his seed, and are cast into a land which they know not?
O earth, earth, earth, hear the word of the LORD.
Thus saith the LORD, Write ye this man childless, a man [that] shall not prosper in his days: for no man of his seed shall prosper, sitting upon the throne of David, and ruling any more in Judah.
Jeconiah had several sons; one was an ancestor of Jesus.
1 Chronicles 3.17-18: View context
Matthew 1:1-16 View context
The book of the generation of Jesus Christ, the son of David, the son of Abraham.
Abraham begat Isaac; and Isaac begat Jacob; and Jacob begat Judas and his brethren;
And Judas begat Phares and Zara of Thamar; and Phares begat Esrom; and Esrom begat Aram;
And Aram begat Aminadab; and Aminadab begat Naasson; and Naasson begat Salmon;
And Salmon begat Booz of Rachab; and Booz begat Obed of Ruth; and Obed begat Jesse;
And Jesse begat David the king; and David the king begat Solomon of her [that had been the wife] of Urias;
And Solomon begat Roboam; and Roboam begat Abia; and Abia begat Asa;
And Asa begat Josaphat; and Josaphat begat Joram; and Joram begat Ozias;
And Ozias begat Joatham; and Joatham begat Achaz; and Achaz begat Ezekias;
And Ezekias begat Manasses; and Manasses begat Amon; and Amon begat Josias;
And Josias begat Jechonias and his brethren, about the time they were carried away to Babylon:
And after they were brought to Babylon, Jechonias begat Salathiel; and Salathiel begat Zorobabel;
And Zorobabel begat Abiud; and Abiud begat Eliakim; and Eliakim begat Azor;
And Azor begat Sadoc; and Sadoc begat Achim; and Achim begat Eliud;
And Eliud begat Eleazar; and Eleazar begat Matthan; and Matthan begat Jacob;
And Jacob begat Joseph the husband of Mary, of whom was born Jesus, who is called Christ.