Led light - trip breaker
It looks like you have a white jumper wire connecting the wirenut that joins the white wires with the wirenut that joins the black wires. Assuming that power comes in via one of the black wires, this jumper is allowing power to flow directly to the neutral wires without any load, causing a short circuit. Without further information it is difficult to say how this should be wired, but I can say with some certainty that you should remove that white jumper.