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CurseForge · Minecraft mod
Error 303
the strange entity in your world
Choose a version Pick your version below, then grab the matching file.
Quick answer
Which Error 303 release matches 1.20.1 Forge?
Best match for your filters entity-1.1.0-forge-1.20.1.jar
Game version 1.20.1
Loader Forge
Error 303 entity-1.1.0-forge-1.20.1.jar targets 1.20.1 with Forge. The project page does not say whether this file belongs on the client, dedicated server, or both. No extra mods listed for this file.
Where it goes
Is Error 303 required on the client, server, or both?
The project page does not say whether this file belongs on the client, dedicated server, or both.
Client Source doesn’t say
Dedicated server Source doesn’t say
Loader for this release Forge
Required install it here Optional supported, not mandatory Not supported do not install here Source doesn’t say do not assume
The source does not explicitly classify this release as client-only or server-only.
What else does Error 303 entity-1.1.0-forge-1.20.1.jar need?
entity-1.1.0-forge-1.20.1.jar on 1.20.1 Forge. Every mod below is checked against that same setup.
This file does not list any required mods. Do not add a library just because a different file uses it.
This file does not list any required or optional mods.
Before you install it
Add Error 303 without breaking your instance.
Built for Error 303 entity-1.1.0-forge-1.20.1.jar on 1.20.1 Forge. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use entity-1.1.0-forge-1.20.1.jar. It targets 1.20.1 with Forge; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
This file does not list any required mods. Do not add a library just because a different file uses it.
- 03
Put it on the correct side
The project page does not say whether this file belongs on the client, dedicated server, or both.
- 04
Pick the file you checked
Use the “Get this file” button beside entity-1.1.0-forge-1.20.1.jar. It opens that exact file at the source.
About this project
What does Error 303 add?
ou thought he was just a myth…
But now, Entity 303 is here—and he’s not just watching.
🔻 What he can do:
- Spawn unexpectedly, often when you’re alone.
- Play disturbing sounds, glitchy and unnatural.
- Place redstone torches, marking his presence.
- Turn day into night, shifting the world into darkness.
He doesn’t need to chase you.
He wants you to know he’s here.
Project description from CurseForge.
Pick your setup
Error 303 by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
Minecraft version
1.21.11
3 loader buildsMinecraft version
1.21.1
3 loader buildsMinecraft version
1.20.1
3 loader buildsMinecraft version
1.19.2
1 loader buildCheck the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
Error 303 versions and loaders
entity-1.1.0-forge-1.20.1.jar
7 Nov 2026
Client Source doesn’t say Server Source doesn’t say Dependencies No extras listed Listed on Release listing
Check the 1.20.1 · Forge setup 1.20.1Forge release
entity-1.0.0-forge-1.20.1.jar
13 Apr 2025
Client Source doesn’t say Server Source doesn’t say Dependencies No extras listed Listed on Release listing
Check the 1.20.1 · Forge setup 1.20.1Forge release
Looking for an older file? The official CurseForge project page is in Resources.
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