This is part of sport. Sometimes a young kid will have a shocker. It either breaks them or they learn and grow from it.
I remember being 18 years old, having just left high school and started playing cricket with adults, I dropped a bunch of catches in one of my first games and lost the game for my team. I felt like crap, had a sulk, then I was motivated to improve my fielding.
Last night looked like a kid who got overwhelmed by the situation and forgot his basics, like watching the ball into your hands, setting your feet under the high ball, being aware of the sideline, etc. I back him to come good, but he needs a week or two off to relax and emotionally recover.