Stop Sign in Parking Lot(Unable to See Driving in from the Side of Building)

My question involves a traffic ticket from the state of: Florida. Hello I was involved in a minor accident while backing up in a parking lot. I never saw a stop sign that was located at MY parking spot. I never did get out of my car, my husband did. I never saw that stop sign. Shouldn't they have to put a stop sign up that's easily seen? They gave me a ticket for,"backing limitations!" I've never heard of that before. Along with everybody else I know.

Please let me know what my recourse would be? Ty for your input!

Stop Sign in Parking Lot(Unable to See Driving in from the Side of Building)