What's the Best Way to Reduce Sorting Errors in a Busy Warehouse?

I recently visited a distribution center where employees were manually sorting hundreds of packages every hour, and I was surprised by how easily mistakes could happen. One of the managers mentioned that incorrect sorting was causing shipping delays and additional costs, especially during peak periods. I've been reading about automated parcel sorting systems and how they can improve accuracy without constantly increasing staff numbers. Has anyone switched from manual to automated sorting, and did it make a noticeable difference in daily operations?