The address book in your AOL mail account allows you to seek out out your contacts and email addresses that you simply have saved in it. The address book comes in handy once you got to send emails to people who are in your contact list and this reduces the hurdle of remembering the complex email address of various users. However, oftentimes, this address book goes completely missing thanks to which you're unable to send emails to your saved contacts. Therefore, if you're also trying to find solutions to repair address book is missing error in AOL mail, then you'll use the steps given within the following section

Ways to repair missing address book error
Method 1- Restore your contacts
To restore the deleted or lost contacts in your AOL mail account, do the following:
1. First of all, attend mail.aol.com from any device
2. Now, log in to your AOL email account
3. If you're already logged in, skip these steps
4. Then, you ought to click on the “More” option
5. After that, tap on the “Restore” option from the available options
6. Next up, you ought to select a date to revive your contacts
7. For this, you'll use the available drop-down
8. Finally, tap on the “Restore” option

Method 2- Troubleshoot network connection
Your AOL mail address book fails to load once you perform the AOL mail login process on a tool with an unstable internet connection. Therefore, you ought to verify if your device is connected to a stable connection or not.

Conclusion-
If these methods don't assist you to repair address book is missing error in AOL mail, then you'll attempt to run the address book sync function. To sync the address book, you'll attempt to log in to your account and follow some easy steps.