Because you were ordered by the court to appear, and you failed to do so, the court can summons you to appear and show cause why you didn't show for the case. Basically, the court wants to know why you asked for its time, got it, and then wasted their time by not showing.
Your best bet is to show up for the next court date and apologize to the judge for failing to appear. Don't give him/her any lame excuses - they've heard them all! Just be honest and tell the truth. You're not going to jail or anything - it is even very unlikely that you'll be fined. The main reason for the summons is so the court can "teach you a lesson" about wasting the court's time - don't be surprised if you are the last person called up on the day of court.
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