Minecraft Error Database
Step-by-step fixes for 198 Minecraft crashes, errors, and issues. Search for your exact error message to find the solution.
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Java Errors
JVM crashes, memory issues, class loading failures, and runtime exceptions that stop Minecraft from running.
38 errorsServer Errors
Dedicated server startup failures, world corruption, TPS drops, plugin conflicts, and configuration problems.
34 errorsMod Errors
Forge, Fabric, NeoForge, and Quilt mod loader crashes, missing dependencies, version mismatches, and conflicts.
35 errorsConnection Errors
Failed connections, authentication issues, timeouts, bad login errors, and multiplayer join failures.
28 errorsLauncher Errors
Game launch failures, black screens, Java detection issues, and profile configuration problems.
24 errorsCrash Reports
Analyzing and fixing crash reports including ticking entities, rendering errors, and block entity failures.
39 errorsAll Errors
How to Fix java.lang.OutOfMemoryError
java.lang.OutOfMemoryError: Java heap space
How to Fix OutOfMemoryError: GC Overhead Limit Exceeded
java.lang.OutOfMemoryError: GC overhead limit exceeded
How to Fix OutOfMemoryError: Metaspace
java.lang.OutOfMemoryError: Metaspace
How to Fix java.lang.StackOverflowError
java.lang.StackOverflowError
How to Fix java.lang.NullPointerException
java.lang.NullPointerException
How to Fix java.lang.ClassCastException
java.lang.ClassCastException: class X cannot be cast to class Y
How to Fix java.lang.NoClassDefFoundError
java.lang.NoClassDefFoundError: com/example/SomeClass
How to Fix java.lang.ClassNotFoundException
java.lang.ClassNotFoundException: com.example.SomeClass
How to Fix UnsupportedClassVersionError
java.lang.UnsupportedClassVersionError: has been compiled by a more recent version of the Java Runtime
How to Fix java.lang.IllegalStateException
java.lang.IllegalStateException
How to Fix java.lang.IllegalArgumentException
java.lang.IllegalArgumentException
How to Fix IncompatibleClassChangeError
java.lang.IncompatibleClassChangeError
How to Fix java.lang.VerifyError
java.lang.VerifyError: Bad type on operand stack
How to Fix java.lang.AbstractMethodError
java.lang.AbstractMethodError
How to Fix java.lang.NoSuchMethodError
java.lang.NoSuchMethodError
How to Fix java.lang.NoSuchFieldError
java.lang.NoSuchFieldError
How to Fix java.lang.LinkageError
java.lang.LinkageError: loader constraint violation
How to Fix java.io.IOException: Stream Closed
java.io.IOException: Stream closed
How to Fix ExceptionInInitializerError
java.lang.ExceptionInInitializerError
How to Fix ConcurrentModificationException
java.util.ConcurrentModificationException
How to Fix ArrayIndexOutOfBoundsException
java.lang.ArrayIndexOutOfBoundsException
How to Fix NumberFormatException
java.lang.NumberFormatException: For input string
How to Fix java.lang.SecurityException
java.lang.SecurityException: Invalid signature file digest
How to Fix java.io.EOFException
java.io.EOFException
How to Fix java.net.UnknownHostException
java.net.UnknownHostException: Unable to resolve host
How to Fix java.lang.RuntimeException
java.lang.RuntimeException
How to Fix Error: Maximum Lock Count Exceeded
java.lang.Error: Maximum lock count exceeded
How to Fix Java Version Not Found
Error: Could not find or load main class
How to Fix Java Heap Space on Servers
java.lang.OutOfMemoryError: Java heap space (Server)
How to Fix UnsatisfiedLinkError
java.lang.UnsatisfiedLinkError: no lwjgl in java.library.path
How to Fix java.net.SocketException
java.net.SocketException: Connection reset
How to Fix Minecraft Ran Out of Memory
Minecraft has run out of memory
How to Fix NoClassDefFoundError: LWJGL
java.lang.NoClassDefFoundError: org/lwjgl/opengl/GL
How to Fix Failed to Bind to Port
FAILED TO BIND TO PORT! Perhaps a server is already running on that port?
How to Fix Server Failed to Start
Failed to start the minecraft server
How to Fix EULA Not Accepted
You need to agree to the EULA in order to run the server
How to Fix World Corruption
Exception generating new chunk / Failed to load level.dat
How to Fix Chunk Corruption
Error: Chunk file at X,Z is corrupted
How to Fix Server TPS Lag
Can't keep up! Is the server overloaded?
How to Fix Server Watchdog Crash
A single server tick took 60.00 seconds (should be max 0.05)
How to Fix Whitelist Not Working
You are not white-listed on this server!
How to Fix Operator Permissions Not Working
I'm sorry, but you do not have permission to perform this command
How to Fix Plugin Failed to Load
Error occurred while enabling Plugin (Is it up to date?)
How to Fix Outdated Client
Outdated client! Please use X.XX.X
How to Fix Outdated Server
Outdated server! I'm still on X.XX.X
How to Fix Too Many Entities Lag
Skipping Entity with id X / Entity count: XXXX
How to Fix Max Tick Time Exceeded
The server has stopped responding! / max-tick-time exceeded
How to Fix Nether Portal Linking Issues
Nether portals linking to wrong locations
How to Fix Spawn Protection Blocking Players
Cannot break/place blocks near spawn
How to Fix Data Packs Not Loading
Failed to load datapacks, can't proceed with server load
How to Fix Invalid World Type
Unknown world type: XXXX
How to Fix Paper Configuration Errors
Failed to load paper global/world configuration
How to Fix Server Resource Pack Failed
Failed to download server resource pack
How to Fix permissions.yml Errors
Cannot load permissions.yml / Invalid permissions configuration
How to Fix Cannot Save World / Save Failed
An error occurred while saving the world / Failed to save chunk
How to Fix Session Lock Error
The save is being accessed from another location
How to Fix server.properties Resetting
server.properties reverting to defaults
How to Fix Forge Crash on Startup
Forge Mod Loader has found a problem with your minecraft installation
How to Fix Fabric Crash on Startup
Fabric Loader has detected a critical error and cannot continue
How to Fix NeoForge Crash on Startup
NeoForge has detected errors during mod loading
How to Fix Missing Mod Dependency
Mod X requires Y version Z or later
How to Fix Fabric API Missing
Mod requires fabric-api @ [*]
How to Fix Mixin Conflict / Mixin Apply Error
Mixin apply for mod X failed / MixinApplyError
How to Fix Forge Version Mismatch
Mod requires Forge version X.X.X or above, currently running Y.Y.Y
How to Fix Duplicate Mod Error
Duplicate mod: X / Found duplicate mod at path
How to Fix OptiFine Mod Conflicts
OptiFine incompatibility / Rendering crash with OptiFine
How to Fix Invalid Mod Configuration
Failed to load config for mod X / Invalid configuration value
How to Fix Quilt Loader Errors
Quilt Loader could not load your game
How to Fix Mod Registry Errors
Registry Object not present / Missing registry entry
How to Fix Coremod Loading Errors
A coremod has been found that is not signed / Coremod loading failed
How to Fix Access Transformer Errors
Invalid access transformer entry / AT parse error
How to Fix Mod World Generation Crash
Exception in world generation / Feature placement crashed
How to Fix Mod Rendering Crash
Rendering entity/block caused an exception
How to Fix Mod Not Loading / Not Appearing
Mod not appearing in mod list
How to Fix Mod Resource Pack Conflicts
Resource pack conflict / Missing textures from mod
How to Fix Client-Server Mod Mismatch
Mod rejections: X - client has Y, server has Z
How to Read Minecraft Mod Crash Reports
---- Minecraft Crash Report ----
How to Fix Shader Pack Crashes
Shader compilation error / Failed to link shader program
How to Fix JEI / REI Loading Errors
JEI encountered an error / REI failed to load
How to Fix Create Mod Errors
Create mod crash / Kinetics calculation error
How to Fix Sodium Crashes
Sodium failed to initialize / Rendering error with Sodium
How to Fix Litematica / Schematic Errors
Failed to load schematic / Litematica rendering error
How to Fix Connection Refused
io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused
How to Fix Connection Timed Out
io.netty.channel.ConnectTimeoutException: connection timed out
How to Fix Failed to Verify Username / Bad Login
Failed to verify username! / Bad login
How to Fix Not Authenticated with Minecraft.net
Failed to login: The authentication servers are currently not reachable
How to Fix Invalid Session (Try Restarting Your Game)
Invalid session (Try restarting your game)
How to Fix io.netty.channel.AbstractChannel Error
io.netty.channel.AbstractChannel$AnnotatedConnectException
How to Fix Kicked for Flying
Flying is not enabled on this server
How to Fix Server is Full
The server is full!
How to Fix You Are Banned from This Server
You are banned from this server!
How to Fix Incompatible Client/Server Version
Incompatible client! Please use X.XX.X / This server is running X.XX.X
How to Fix That Name is Already Taken
That name is already taken
How to Fix Packet Too Large / Payload Too Large
Packet too large! / Payload may not be larger than X bytes
How to Fix Disconnect: Spam
Kicked for spamming
How to Fix Internal Exception: Decoder
Internal Exception: io.netty.handler.codec.DecoderException
How to Fix java.net.ConnectException
java.net.ConnectException: Connection refused: no further information
How to Fix Multiplayer is Disabled
Multiplayer is disabled. Please check your Microsoft account settings.
How to Fix Illegal Characters in Chat
Illegal characters in chat / Disconnected
How to Fix Connection Issues Behind VPN/Proxy
Connection error when using VPN or proxy
How to Fix End of Stream Disconnect
Internal Exception: java.io.IOException: An existing connection was forcibly closed
How to Fix Encryption Error on Connect
Internal Exception: javax.crypto.AEADBadTagException: Tag mismatch
How to Fix Minecraft Not Launching / Nothing Happens
Game output: Process exited with code 1 / Game crashed before starting
How to Fix Java Not Found by Launcher
Unable to find Java / No compatible Java installation found
How to Fix Black Screen on Launch
Minecraft shows black screen / window opens but nothing displays
How to Fix Exit Code 0 Crash
Game ended with exit code: 0
How to Fix Exit Code 1 Crash
Game ended with exit code: 1
How to Fix Exit Code -1 Crash
Game ended with exit code: -1
How to Fix Corrupted Launcher Profile
Unable to load profiles / launcher_profiles.json corrupted
How to Fix Asset Download Failed
Failed to download file / Could not download asset index
How to Fix Natives Extraction Failed
Failed to extract natives / Unable to extract native libraries
How to Fix MultiMC/Prism Instance Launch Error
Error: Instance X failed to start / Could not set up instance
How to Fix Microsoft Account Login Failed
Failed to login with Microsoft account / Authentication error
How to Fix Crash on Loading Screen
Game crashes during Mojang Studios loading screen
How to Fix Launcher Download Blocked by Antivirus
File download blocked / Threat detected in download
How to Fix High CPU Usage in Minecraft
Minecraft using 100% CPU / excessive CPU usage
How to Fix No Sound in Minecraft
No audio / sound effects not playing
How to Fix Pixel Format Not Accelerated
org.lwjgl.LWJGLException: Pixel format not accelerated
How to Fix Ticking Entity Crash
java.lang.RuntimeException: Ticking entity
How to Fix Ticking Block Entity Crash
java.lang.RuntimeException: Ticking block entity
How to Fix Ticking World / Ticking Screen Crash
java.lang.RuntimeException: Ticking world / Error executing task on Client
How to Fix OpenGL Error Crashes
OpenGL Error: 1281 (Invalid value) / 1282 (Invalid operation)
How to Fix Out of Video Memory Crash
GL ERROR: Out of memory! / VRAM exhausted
How to Fix ConcurrentModificationException in World Tick
java.util.ConcurrentModificationException during world tick
How to Fix Crash While Saving Chunks
Exception saving chunks / Error saving chunk at X, Z
How to Fix Crash While Loading Chunks
Exception in chunk loading / Error loading chunk at X, Z
How to Fix Crash Rendering Screen
Error: java.lang.RuntimeException: Rendering screen
How to Fix Crash Loading Resource Pack
Error loading resource pack / Failed to reload resources
How to Fix JVM Native Crash (hs_err_pid)
A fatal error has been detected by the Java Runtime Environment / hs_err_pidXXXXX.log
How to Fix Mixed Mappings / Remapping Error
Mapping conflict / Remap error / SRG/MCP name mismatch
How to Fix DataFixer / DFU Crash
Error during DataFixer initialization / DFU failed
How to Fix Font / Text Rendering Crash
Exception rendering font / Error rendering text
How to Fix Crash on Player Login / Join
Error handling player login / Exception ticking player
How to Fix Sound Engine Crash
Error in class SoundEngine / OpenAL error
How to Read Minecraft Crash Reports
---- Minecraft Crash Report ----
How to Fix Crash Loading Dimension (Nether/End)
Exception loading dimension / Error loading Nether or End
How to Fix NBT Data Too Large Crash
Tried to read NBT tag that was too big / NBT size limit exceeded
How to Fix Java Security Provider Error
Error initializing Security Provider / SecureRandom not available
How to Fix World Upgrade Failure
Failed to upgrade world / World conversion error
How to Fix Crash During Terrain Generation
Exception generating new chunk terrain / WorldGen crash
How to Fix Command Block Crash
Error executing command block at X Y Z
How to Fix Crash from Full/Corrupted Inventory
Ticking player / Exception in player inventory processing
How to Fix OutOfMemoryError: Direct Buffer Memory
java.lang.OutOfMemoryError: Direct buffer memory
How to Fix IndexOutOfBoundsException
java.lang.IndexOutOfBoundsException
How to Fix java.lang.InternalError
java.lang.InternalError: a fault occurred in a recent unsafe memory access operation
How to Fix UUID Mismatch After Online Mode Change
Player data not found / Inventory lost after online-mode change
How to Fix Geyser/Floodgate Connection Errors
Geyser failed to initialize / Floodgate auth error
How to Fix Server Backup Failed
Backup failed / Error creating backup archive
How to Fix Velocity/BungeeCord Proxy Errors
If you wish to use IP forwarding, please enable it in your BungeeCord config
How to Fix RCON Not Connecting
RCON connection failed / Unable to connect to RCON
How to Fix World Border Problems
Players cannot go beyond world border / World border not working
How to Fix Iris Shader Errors
Iris: Failed to compile shader pack / Shader compilation error
How to Fix Fabric Loader Outdated
Mod requires fabric-loader version X.X.X or later
How to Fix Performance Mod Conflicts
Crash with multiple optimization mods installed
How to Fix Architectury API Errors
Architectury API failed to load / Missing architectury
How to Fix Cloth Config API Errors
Mod requires cloth-config / Cloth Config failed to load
How to Fix WorldEdit Errors
WorldEdit: Maximum blocks changed limit reached / Selection too large
How to Fix Read Timed Out
io.netty.handler.timeout.ReadTimeoutException
How to Fix Failed to Synchronize Registry Data
Failed to synchronize registry data from server
How to Fix Chat Reporting / Signing Kick
Multiplayer requires a signed key / Chat messages must be signed
How to Fix Bedrock-Java Crossplay Issues
Unable to connect to Java server from Bedrock
How to Fix Unable to Resolve Hostname
Can't resolve hostname / Unknown host
How to Fix CurseForge/Modrinth Modpack Download Fail
Failed to download modpack / Some files could not be downloaded
How to Fix OpenGL Version Too Old
Minecraft requires OpenGL 4.4 or higher / GL version too low
How to Fix Minecraft on Apple Silicon (M1/M2/M3/M4)
Crash on Apple Silicon / LWJGL ARM error
How to Fix Minecraft on Steam Deck
Minecraft not launching on Steam Deck / Controller issues
How to Fix Forge Installer Failure
Forge installer: Error during installation / These libraries failed to download
How to Fix Raytrace / Block Interaction Crash
Exception while raycasting / Error in block interaction
How to Fix Recipe Loading Crash
Error loading recipes / Failed to parse recipe
How to Fix Advancement Loading Crash
Error loading advancements / Failed to parse advancement
How to Fix Unknown Biome Error
Unknown biome id / Biome not found in registry
How to Fix Shader Compilation Failed
Error compiling shader: vertex/fragment shader failed
How to Fix Scoreboard Data Crash
Error loading scoreboard data / Scoreboard objective already exists
How to Fix Structure Generation Crash
Exception placing structure / Structure generation failed
How to Fix Networking Buffer Overflow Crash
io.netty.handler.codec.EncoderException: Buffer overflow / Packet size exceeded
How to Fix InvocationTargetException
java.lang.reflect.InvocationTargetException
How to Fix ZipException: Invalid LOC Header
java.util.zip.ZipException: invalid LOC header (bad signature)
How to Fix Random Lag Spikes on Server
Server experiencing intermittent lag spikes / TPS drops periodically
How to Fix Query Port Error
Unable to initialise query on port / Query running on port
How to Fix Immersive Engineering Crashes
Immersive Engineering: Multiblock validation failed / IE rendering crash
How to Fix Applied Energistics 2 Errors
AE2: Channel calculation error / ME network crash
How to Fix Server Transfer Error (1.20.5+)
Transfer failed / Unable to transfer to server
How to Fix Resource Pack Download Refused
Disconnected: Server resource pack required but refused
How to Fix Java 21 Required for 1.21+
Minecraft 1.21 requires Java 21 or newer
How to Fix Audio Issues on Linux
No sound on Linux / ALSA/PulseAudio error with Minecraft
How to Fix Entity Rendering Crash
Error rendering entity / Exception in entity renderer
How to Fix Crash When Entering the Nether
Exception ticking world DIM-1 / Crash entering Nether portal
How to Fix Crash When Entering the End
Exception ticking world DIM1 / Crash entering End portal
How to Fix Server Difficulty Locked
Cannot change difficulty / Difficulty locked
How to Fix Tick Rate Issues (1.20.5+)
Server running at non-standard tick rate / Custom tick rate issues
How to Fix Mod Memory Leaks
Gradual memory increase / OutOfMemoryError after extended play
How to Fix Forge to NeoForge Migration Issues
Mod built for Forge not working on NeoForge
How to Fix Slow Login / Long Connection Time
Login takes very long / Stuck on 'Logging in...' screen
How to Fix Windows Defender Blocking Minecraft
Windows Defender blocked Minecraft / Java platform SE binary blocked
How to Fix Corrupted Assets Index
Failed to load asset index / Asset index corrupted
How to Fix Map Item Rendering Crash
Exception rendering map / Map data corrupted
How to Fix Particle Rendering Crash
Exception rendering particles / Particle system error
How to Fix World Loading Timeout
World loading took too long / Timed out waiting for world load