To use D102's Google Apps for Education domain, you cannot have an individual Google account that uses your "@d102.org" email address. Fortunately, it's possible to remedy this situation by changing your existing, individual Google account.
See this page for instructions: Editing your Google Account Username
Note: One good option available to D102 staff is to change the username to the "@aptakisic.k12.il.us" version of your email address.
If you no longer need your personal Google account, you're welcome to delete it before we activate your Google Apps account, just be sure to download and save any data you have in your individual account.