Error_405-0.8.1-neoforge-1.21.1.jar is a release file of the Minecraft mod Error_405 for NeoForge, made for Minecraft 1.21.1. It was published on September 26, 2026 and is 12.4 MB in size. For the full description, screenshots and every other version, visit the Error_405 mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.
