If your email account is displaying an error message, the first step is to try resetting your password. If that doesn’t work, try deleting and re-adding the account to your device. If that still doesn’t work, make sure your device is up-to-date with the latest software, and then check that there are no login issues with your mail server provider. If none of these steps work, consider contacting the email provider you are using, or seek technical support.