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It sounds like a short in the light fixture. Can you please shut the breaker off. take the light fixture down. if there are multiple wires in the box only disconnect the wire leads from fixture keep other splices as they are. cap off the wires that were connected to the light fixture ( remember or label which wires were connected to it). Then turn the breaker on. flip the switch on and tell m if it still trips the breaker.
Ok. Let me know.