Possible causes
- Using a Web browser that's not supported by AOL Mail
- Accessing your AOL Mail account simultaneously from 2 different browsers
- Accessing your AOL Mail account on multiple devices simultaneously from more than one place
Possible fixes
- Restart your Web browser
- Clear your Web browser's cache
- Make sure you're using a supported Web browser and operating system (OS)
- Sign out of all devices and sign back in to AOL Mail to see if the error is gone
- If the problem persists, we recommend using an email app like the AOL app for iOS and Android or the native mail app on your smartphone or tablet device