Minecraft Crash Doctor (Java)
Drop your crash report (or latest.log) and Crash Doctor tells you why Minecraft crashed and how to fix it: wrong Java version, missing or clashing mods, too little RAM, graphics drivers or a broken world.
Runs on your device · nothing uploaded
This tool is code that runs inside your browser. Your files, text and pictures are read here and never sent to a server, so it even works offline once loaded. Signed in? Only what you save to your account (My Kit, wardrobe) or publish is uploaded.
Drop your crash report, latest.log or the whole .minecraft folder
🔒 Read on your device only. Nothing is uploaded.
Where is my .minecraft folder?
- Windows
%appdata%\.minecraftPress Win + R, paste this and press Enter. - macOS
~/Library/Application Support/minecraftIn Finder press Cmd + Shift + G and paste this. - Linux
~/.minecraftShow hidden files in your file manager. - CurseForge, Prism, Modrinth and other launchers keep each instance in its own folder: right-click the instance and choose “Open folder”. Crash reports are in the crash-reports folder, logs in the logs folder.
EXAMPLEThis is a sample diagnosis of a made-up crash. Drop your own crash report or latest.log to check yours.
Found 2 problems
- Fix this
Minecraft 1.21.1 needs Java 21, but Java 17 is running
Each Minecraft version needs a minimum Java version. Older Java can crash at start or behave oddly.
- Install Java 21.
- Select it in your launcher's Java settings for this profile or instance.
- Fix this
Missing or wrong mod versions (2 problems)
Fabric checks every mod's requirements before starting. One or more requirements are not met.
Sodium ExtraIris
- Install the missing mod: Sodium. Download the version made for your Minecraft version.
- Update or change these to the required version: Sodium (have 0.5.8).
- Start the game again. If another mod is listed, repeat for it.
.
What Crash Doctor can detect
| Problem | Typical sign in the log |
|---|---|
| Java too old or too new | UnsupportedClassVersionError, Unsupported class file major version |
| Missing or wrong-version mods (Fabric, Quilt) | Incompatible mods found! |
| Missing dependencies (Forge, NeoForge) | Missing or unsupported mandatory dependencies |
| Same mod installed twice | Mod ID … is duplicated / Found duplicate mods |
| A mod failing to patch the game | MixinApplyError, InvalidInjectionException |
| Missing Fabric API or library | NoClassDefFoundError, ClassNotFoundException |
| Out of memory | java.lang.OutOfMemoryError |
| Graphics driver crash | atio6axx.dll, nvoglv64.dll, GLFW error 65542 |
| Broken entity or chunk in a world | Ticking entity, Couldn't load chunk |
| Server problems | FAILED TO BIND TO PORT, EULA, watchdog tick |
How to use it
- Open your .minecraft folder (the box above shows where it is) or your launcher instance folder.
- Drag the crash-reports folder, a crash-….txt file or logs/latest.log onto the box. You can also drop the whole folder.
- Read the problems found, starting from the top, and follow the numbered fix steps.
- Still stuck? Press Copy safe report: it removes your user name, tokens and IP address so you can share it safely.
How it works
Crash Doctor reads the text of your report in your browser and looks for patterns that point to known causes, such as UnsupportedClassVersionError (wrong Java), Fabric or Forge dependency lists, mixin errors from a specific mod, OutOfMemoryError and graphics driver crash frames. It also checks your Minecraft version against the Java version Mojang requires for it. Your files are never uploaded.
Questions
Where do I find my Minecraft crash report?
In the crash-reports folder inside .minecraft (on Windows, press Win + R and type %appdata%\.minecraft). Launchers like CurseForge and Prism keep a separate folder for each instance.
Is it safe to drop my files here?
Yes. The files are read by your browser on your own device and are never uploaded. The safe report also hides your user name, login tokens and IP address before you share it.
What if no problem is found?
Try the newest file in crash-reports rather than latest.log, then update your mods, Java and graphics driver. If it still crashes, share the safe report on the mod's issue page.
Does it work for Bedrock?
No. Bedrock does not write these Java crash reports. Crash Doctor is for Minecraft: Java Edition, vanilla or modded, and Java servers.
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By PickaxeKit Editorial Team. Updated 2026-11-09.