Hytale Server Won't Start: Fix Startup Errors
Most startup failures are caused by missing Java 25, a missing Assets.zip file, or a broken config.json. Use the steps below to restore a clean boot.
Common Startup Errors
| Error | Cause | Fix |
|---|---|---|
| Unsupported Java version | Java 25 not installed | Install Java 25 and re-run |
| Assets.zip not found | Missing or wrong path | Pass --assets Assets.zip with correct file |
| Config parse error | Invalid JSON in config.json | Validate JSON or regenerate config |
| Port already in use | Another service uses the port | Change --bind port or stop the conflict |
Step-by-Step Fix
- Check Java version. Hytale requires Java 25:
java -version
- Start with assets explicitly. Use the standard launch command:
java -jar HytaleServer.jar --assets Assets.zip
- Validate config.json. The main config lives in
config/config.json. Fix JSON syntax or move it aside to regenerate on boot. - Check logs. Review
logs/hytale-server.logfor the exact failure line. - Verify ports. If port 5520 is busy, change the bind port:
--bind 0.0.0.0:5521.
Note: After a clean boot, re-apply your settings and test with no mods before enabling them again.
Keep Hytale stable. Host your Hytale server with Supercraft for pre-configured Java and verified assets.