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Minecraft error fixes

Paste your crash log or type the error. We match it to known causes and step-by-step fixes.

Error finder

Open logs/latest.log or the newest file in crash-reports, copy everything and paste it here. Nothing is uploaded; matching runs in your browser.

Exit codes

  • Minecraft "Exit Code 1" crash

    How to find and fix the cause of Minecraft closing with exit code 1, usually a mod error, the wrong Java version or a mod built for another loader.

  • Minecraft "Exit Code -1" crash

    What exit code -1 means in Minecraft and how to fix it, from mod crashes during loading to driver and memory settings.

  • Minecraft "Exit Code 255" crash

    Fix exit code 255 in modded Minecraft. Common causes are mods that cannot load, an incompatible Java version and broken JVM arguments.

Loading and mods

  • Minecraft crashes on startup

    A step-by-step method to find why modded Minecraft crashes while launching or loading, and how to fix it without guessing.

  • Incompatible mods and version mismatches

    Fix "incompatible mod set" and version mismatch errors in Forge, NeoForge and Fabric by matching every mod to your Minecraft version and loader.

  • Missing mod dependencies

    Fix crashes caused by missing libraries such as Fabric API, Citadel, Balm or Curios. Find which dependency is missing and install the right version.

  • Mod conflicts and mixin errors

    Find and fix conflicts between two mods, including mixin injection failures and mods that cannot be installed together.

  • Common Forge and NeoForge errors

    How to read Forge and NeoForge loading errors such as ModLoadingException and "Failed to create mod instance", and how to fix them.

  • Common Fabric and Quilt errors

    How to read Fabric errors such as "incompatible mod set", mixin failures and entrypoint crashes, and how to fix them.

Java and memory

  • Java version errors in Minecraft

    Fix UnsupportedClassVersionError and other crashes caused by running Minecraft or a mod loader on the wrong Java version.

  • Out of memory and RAM problems

    Fix OutOfMemoryError, "Java heap space" and "Could not reserve enough space for object heap" by allocating the right amount of RAM.

Graphics and performance