One of the two following reasons can cause Error 001004:
- Another device is already using your account.
- You have restored your account from a backup application such as iTunes or iCloud.
To fix this error, delete and reinstall Dragon Project and then try logging in again.
If the issue persists, contact Customer Support and provide the following details:
- Hunter ID
- Hunter name and level
- Answer to your secret question
- Last log-in date and time