Unknown File Error

What is Unknown File Error?

The unknown file error happens when the patcher detects an unkown, corrupt, or missing file during the patch process.

How do I resolve this error?

Run a repair
  1. Open the TERA Launcher
  2. Click the "Tools" link
  3. Select the repair option
  4. Let the repair finish before you click the play button. If you click play before finishing you will crash with an Fatal Client Exception: FFFF:FFFF error. You will then need to close out of the launcher, sign in, and run the repair again.

Note: The repair can take up to an hour.


If repair did not resolve the issue, replace the three following files.
  1. Exit and close completely out of the TERA launcher.
  2. Right-click your TERA launcher icon and click "Open File Location".
  3. Drag (do not delete) these three files from the TERA folder to your desktop: "EN.Version", "Game.version", and "Live2-Launcher.version"
  4. Right click and select "Save link as..." for the files listed below. Save them to your TERA Folder where you just removed the previous ones.
  5. - EN.version
    - Game.version
    - Live2-Launcher.version
  6. Restart the launcher, sign in, but do not press the play button.
  7. Click on the "Tools" link under the progress bar and select "Repair". The repair can take an hour to complete.
  8. Do not click the play button until the repair is finished. If you click play before finishing you will crash with an FFFF:FFFF error. You will then need to close out of the launcher, sign back in and run a repair again.

Common Mistakes and Things to Know

Insufficient Free Disk Space

If there is not enough disk space for the repair the patch/repair will fail; the Play button will not be enabled (turn Yellow) and the message in the Blue status bar may say "Source file was corrupted". If you run into the situation, please ensure that you have at least 35 GB of free space on the drive that TERA is installed on, and that you are running the launcher as admin (right-click launcher and select "run as admin"). The patch will NOT complete until there is enough free disk space. The repair process does not re-download the whole game, but it is checking every file for the game, and that is why it needs that available space.


Fatal Client Exception: Error FFFF:FFFF

You did not let the repair finish before you clicked the play button. If you click play before the repair is complete you will receive an FFFF:FFFF error. You will then need to close out of the launcher, sign back in and run a repair again.


The repair is stuck at 99%

If the repair is stuck at 99%, meaning it has been at 99% for several minutes, close out of the launcher and open it back up. It will finish after you sign in and should not be impacted by the above bullet point. In the rare use case the patch does not finish, you will need to run the repair manually.


The estimated time for repair is very long "Longer than 7 days."

The time predicted to complete can be inaccurately long. It will NOT take "More than seven days" to run the verify & repair. Please don't panic or exit before it finishes. The progress time for verify/repair can be unreliable.

Contact Support if the steps above failed

If none of these steps resolved your issue, please contact support and include your developer logs. These logs will indicate which file is failing and we can look to replace it and fix the patcher so it doesn't happen again.