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Completely Missing the Ball 

This can be quite frustrating but easily cured.   
The problem is focus, perception, and often times a nervous reaction to attackers and external pressures. 
Bring a tennis ball and a golf ball or ping pong ball to practice and keep 'em in your pocket. 
The moment they miss or slice, toss out the tennis ball and take the soccer ball away. 
Continue play. 
It's actually fun, funny, and they'll never forget it, plus they'll usually want to avoid your pulling it out again. 
If they miss the tennis ball, replace the tennis ball with the ridiculously small golf ball or ping pong ball. 
It sounds goofy but focusing on the smaller target develops their skill and forces them to keep their eye on the ball, 
a good habit that's always been a challenge. It only takes a couple of times to produce amazing improvement.