If Minecraft is crashing right after you install Verity JE on NeoForge 1.21.1, you’re not doing anything wrong. This isn’t a random compatibility bug you need to troubleshoot piece by piece — it’s a known, developer-confirmed issue with that specific version pairing.
The Developer Already Flagged This
On Verity JE’s official CurseForge listing, developer VarmiteYT posted this warning directly on the mod page:
“NEOFORGE 1.21.1 IS DEPRECATED AND HAS MANY BUGS”
That’s not a community rumor or a guess from a forum thread — it’s the mod’s own author telling you the 1.21.1 NeoForge build is the problem, not your setup. If you installed Verity JE on NeoForge 1.21.1 and you’re getting crashes, freezing, or broken AI responses, this is very likely why.
What to Do Instead
Verity JE currently supports two Minecraft versions:
- 1.21.1 — via NeoForge (the deprecated, bug-prone build described above)
- 1.20.1 — via Forge (the actively maintained main release, most recently updated)
If you’re free to choose your Minecraft version, install on 1.20.1 with Forge instead. That’s where the mod’s main file and most recent updates are landing, based on the current CurseForge listing.
If you specifically need 1.21.1 for another mod in your pack, you have two realistic options:
- Accept that Verity JE may behave unreliably on that version until the developer patches it, and downgrade your expectations for stability accordingly.
- Build your modpack around 1.20.1 instead, if nothing else in your pack strictly requires 1.21.1.
Quick Checklist Before You Reinstall
- Confirm you’re using NeoForge, not regular Forge, if you’re attempting the 1.21.1 build — using the wrong loader entirely is a separate, more common crash cause.
- Delete the old Verity JE .jar completely before installing a different version — don’t just drop the new file in alongside the old one.
- If switching to 1.20.1, make sure your NeoForge/Forge installation matches 1.20.1 as well, not just the mod file. A mismatched loader version causes the exact same crash-on-launch symptom.
- Check your crash log’s first few lines for the mod ID before assuming it’s Verity — if you’re running a modpack, another mod entirely may be the actual cause.
Still Crashing on 1.20.1?
If you’re on the recommended 1.20.1 + Forge combination and still seeing crashes, the cause is more likely a different conflict: another mod targeting a different Minecraft version, a missing dependency, or an outdated Java install (Verity JE requires Java 17 or newer). Check the crash report for the specific mod ID it names before assuming it’s Verity again