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 / log | Fix |
|---|---|
| Mod X requires Y | Install mod Y in mods/ |
| Incompatible mod set | Align all mods to same MC/Forge |
| UnsupportedClassVersionError | Install Java 17 |
| OutOfMemoryError | -Xmx8G or more RAM in panel |
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Frequently asked questions (FAQ)
Forge server won't start – first steps?
Read logs/latest.log and crash-reports/. Common: mod version mismatch for MC version, Java too old, missing dependency mod.
Mod loading error / missing dependency?
Install missing mod from log. Align all mods to same Minecraft + Forge version. Remove mods one by one to test.
Forge or Fabric – different errors?
Forge uses forge-*.jar + mods/ folder. Fabric uses fabric-server-launch.jar. Never mix Forge and Fabric mods.