Can this transit ticket mistake be remedied?

I just started college last week, and we're given a transit sticker pass on our school ID. I was asked for my ticket by a transit officer. I actually bought a ticket earlier that day like usual, but I could not find it in all my pockets. He asked for my ID. The only ID I had was my school ID, which he used to write me a pink ticket. New to college, and much on my mind, I forgot that sticker on my ID is a light rail pass. Why didn't the officer know this when he used my school ID to ticket me? Who do I contact to clear this mistake? What do I say?