error in insert function

public static PhoneBookEntry [] insert(PhoneBookEntry p, PhoneBookEntry [] aContacts) {
int len = aContacts.length;
PhoneBookEntry [] aContacts2 = new PhoneBookEntry[len+1];

for (int x=0; x<len; x++) {
aContacts2[x] = aContacts[x];
}

aContacts2[len+1].name = p.name;
aContacts2[len+1].number = p.number;

aContacts = aContacts2;
System.out.println("Name" + aContacts[0].name + " Number " + aContacts[0].number);


return aContacts2;
}