Most dishwashers have a cylindrical or flat filter at the bottom. Twist it counterclockwise and lift it out. Check your manual for exact location.
Spin the impeller (small fan-like piece) by hand. It should turn freely. Remove any glass shards or hard objects. clean drain dishwasher
Replace the filter and rack. Run a short hot-water cycle with no detergent to flush out loosened debris. Most dishwashers have a cylindrical or flat filter