Typical symptoms
- The server stops immediately after you click "Start".
- Java or OutOfMemory errors appear in the console.
- The log ends with "Could not load…" or "Missing dependencies".
Main causes
Not enough memory
Xms/Xmx set too low causes a crash while loading chunks or mods.
Incompatible mods
Mods of different versions conflict with each other or with the server core.
Wrong Java
1.20+ needs Java 17, while older versions need Java 8.
Broken configs
Errors in server.properties or wrong startup arguments.
Step-by-step fix
- Check the startup log in the control panel and find the first line with an error.
- Make sure the Java version matches the server and modpack version.
- Allocate more memory: set Xms and Xmx to at least 4G for modded packs.
- Disable the most recently installed mod or plugin, then restart the server.
- Reset server.properties to the defaults and apply your changes again.
Example of a correct startup command
java -Xms4G -Xmx6G -jar paper.jar noguiPrevention
Make backups before updates, install mods one at a time and keep a separate list of versions. If the problem keeps coming back, send the logs to 5GHz Hosting support and we will find the conflict quickly.