# Minecraft Forge Server Won't Start – Mods, Java & Crash Reports

Minecraft Forge server won't start? Mod conflicts, wrong Forge version, Java 17, crash reports – modded Minecraft server troubleshooting.

**Quick answer:** Forge won't start: **read crash-reports/ + latest.log**, **match Forge to MC version**, **Java 17+** and install missing mod dependencies.

**If you landed here:** Forge JAR crashes on mod loading, "Mod X requires Y" or server stops after seconds.

## Error → fix

Symptom / logFix

Mod X requires YInstall mod Y in mods/

Incompatible mod setAlign all mods to same MC/Forge

UnsupportedClassVersionErrorInstall Java 17

OutOfMemoryError-Xmx8G or more RAM in panel

## Related

- [Minecraft won't start](/en/gameserver/minecraft/server-startet-nicht)
- [Install mods](/en/gameserver/minecraft/install-mods)
- [Paper vs Spigot (not Forge)](/en/gameserver/minecraft/paper-vs-spigot)
- [Minecraft lagging](/en/gameserver/minecraft/laggt)
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