When a game receives an official update, it might overwrite the modified Zone En-core-pre-gfx file, requiring you to re-apply it.

If you consistently suffer from missing or corrupted zone files, your storage drive might be failing to read the data fast enough, causing the engine to timeout and report the file as missing. Uninstalling the game and doing a clean installation on an internal Solid State Drive (SSD) frequently resolves persistent Dev Errors permanently. Conclusion

If you have already downloaded the file but still see errors, try these fixes: