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For crashes related to the Pixelmon launcher before starting Minecraft, see this page.

So I herd you liek crashing? Well good! I am here to help to fix those pesky crashes! Welcome to Crash Reading 101. A "crash" course! Minecraft runs very specifically especially when installing mods and the smallest error, as you know, can cause the mod to crash! >:( But do not fret! I am here to help! Let's start. Here I have gathered a bunch of crashes around the Pixelmon forums and compiled them into one universal tutorial anyone can understand!

How to use this guide

  • To identify the cause of a crash, look in the section of the crash report under "Description"; this section is near the top of the report. Once you have found this section, search for the first line of that section in this guide by looking down the list or by using your browser's search feature. An example of where to find this line in a crash report is shown in the image below.
  • Each bullet point is a separate crash report, although it is possible for multiple different crashes to be caused by the same underlying issue.
  • If your crash report doesn't match any of these issues, post the full report in the support tracker.
The part of the crash report to look at.

Crash reports

Version 5.0.x

  • "java.lang.OutOfMemoryError: Java heap space"
  • "net.minecraftforge.fml.common.LoaderException: java.lang.OutOfMemoryError: Java heap space"
  • "net.minecraftforge.fml.common.LoaderException: java.lang.NoClassDefFoundError: com/pixelmonmod/pixelmon/..."
  • "SplashProgress has detected a error loading Minecraft."
  • "Caused by: java.lang.IllegalAccessError: tried to access field net.minecraft.client.renderer.entity.RenderManager.field_178636_l from class com.pixelmonmod.pixelmon.client.ClientProxy"
  • "at net.minecraft.world.World.getSkyColorBody(World.java:1477)"

You haven't allocated enough memory to Minecraft. See Fixing memory issues for instructions about how to solve this issue.


  • "Caused by: java.lang.NoSuchMethodError: com.pixelmonmod.pixelmon.items.PixelmonItemBlock.func_77655_b(Ljava/lang/String;)Lnet/minecraft/item/ItemBlock;"

You need to use Minecraft 1.10.2 with this version of Pixelmon.


  • "java.lang.NoClassDefFoundError: com/pixelmonmod/pixelmon/items/ItemBlock"

You need to update Gameshark to the latest version.


  • "net.minecraftforge.fml.common.LoaderException: java.lang.NoClassDefFoundError: com/pixelmonmod/shaded/ninja/leaping/configurate/loader/ConfigurationLoader"

Gym Wars 2: Feebas Unleashed is incompatible with this version of Pixelmon. You will need to remove this sidemod until it is updated to be compatible.

Version 4.3.x/4.2.x

  • "java.lang.OutOfMemoryError: Java heap space"
  • "net.minecraft.client.renderer.StitcherException: Unable to fit: missingno - size: 16x16 - Maybe try a lowerresolution resourcepack?"
  • "net.minecraftforge.fml.common.LoaderException: java.lang.OutOfMemoryError: Java heap space"
  • "net.minecraftforge.fml.common.LoaderException: java.lang.NoClassDefFoundError: com/pixelmonmod/pixelmon/..."
  • "net.minecraftforge.fml.client.SplashProgress$5: java.lang.IllegalStateException: Splash thread"
  • "SplashProgress has detected a error loading Minecraft."

You haven't allocated enough memory to Minecraft. See Fixing memory issues for instructions about how to solve this issue.


  • "net.minecraftforge.fml.common.LoaderException: java.lang.ClassNotFoundException: com.pixelmonmod.pixelmon.Pixelmon"

You need to update your Java version to Java 8.


  • "org.lwjgl.LWJGLException: Pixel format not accelerated"

Your graphics card is incompatible with Minecraft. There are several different causes and corresponding solutions to this issue; try this page.


  • "net.minecraftforge.fml.common.LoaderException: java.lang.IllegalAccessError: tried to access field net.minecraft.client.renderer.entity.RenderManager.field_178636_l from class com.pixelmonmod.pixelmon.client.ClientProxy"

Make sure you did not extract or unzip the contents of the Pixelmon jar; place the entire jar into the mods folder. If you have already done this correctly, check if your Pixelmon jar's extension is ".jar.zip"; if so, change the extension to ".jar". If you do not see the ".zip" extension, you may need to have extensions showing on your system; a tutorial on how to do so can be found here.


  • "java.lang.NoClassDefFoundError: com/pixelmonmod/pixelmon/items/ItemBlock"

Gameshark is incompatible with this version of Pixelmon. You will need to remove Gameshark until it is updated to be compatible.

Version 4.1.x

  • "java.lang.OutOfMemoryError: Java heap space"
  • "net.minecraftforge.fml.common.LoaderException: java.lang.OutOfMemoryError: Java heap space"
  • "net.minecraftforge.fml.common.LoaderException: java.lang.NoClassDefFoundError: com/pixelmonmod/pixelmon/..."
  • "net.minecraftforge.fml.client.SplashProgress$5: java.lang.IllegalStateException: Splash thread"
  • "net.minecraft.client.renderer.StitcherException"

You haven't allocated enough memory to Minecraft. See Fixing memory issues for instructions about how to solve this issue.


  • "Could not reserve enough space for...object heap"

See Fixing memory issues for instructions about how to solve this issue.


  • "net.minecraftforge.fml.common.LoaderException: java.lang.NoClassDefFoundError: net/minecraftforge/common/util/EnumHelper"
  • "java.lang.NoClassDefFoundError: net/minecraftforge/client/model/ItemLayerModel"

Use the recommended Forge version listed on the Pixelmon downloads page.

  • "net.minecraftforge.fml.common.WrongMinecraftVersionException: Wrong Minecraft version for pixelmon"

You need to use Minecraft version 1.8 to use Pixelmon.

Version 4.0.x

  • "net.minecraftforge.fml.common.LoaderException: java.lang.NoClassDefFoundError: com/pixelmonmod/pixelmon/entities/npcs/EntityTrainer"

Remove Trainer Commands from your Pixelmon launcher profile and re-add it.


  • "java.lang.OutOfMemoryError: Java heap space"
  • "java.lang.OutOfMemoryError: GC overhead limit exceeded"
  • "java.lang.OutOfMemoryError: Rendering Block Entity"
  • "java.lang.IllegalStateException: Splash thread"
  • "net.minecraft.client.renderer.StitcherException"
  • "net.minecraftforge.fml.common.LoaderException: java.lang.OutOfMemoryError: Java heap space"
  • "net.minecraftforge.fml.common.LoaderException: java.lang.NoClassDefFoundError: com/pixelmonmod/pixelmon/..."

You haven't allocated enough memory to Minecraft. See Fixing memory issues for instructions about how to solve this issue.


  • "org.lwjgl.LWJGLException: Pixel format not accelerated"

Your graphics card is incompatible with Minecraft. There are several different causes and corresponding solutions to this issue; try this page.


  • "net.minecraftforge.fml.common.LoaderException: java.lang.NoClassDefFoundError: net/minecraftforge/client/model/IModel"
  • "net.minecraftforge.fml.common.LoaderException: java.lang.NoClassDefFoundError: net/minecraftforge/client/model/ModelLoader"
  • "net.minecraftforge.fml.common.LoaderException: java.lang.NoSuchMethodError: net.minecraftforge.client.model.ModelLoader.setCustomStateMapper(Lnet/minecraft/block/Block;Lnet/minecraft/client/renderer/block/statemap/IStateMapper;)V"
  • "java.lang.NoClassDefFoundError: net/minecraftforge/common/util/EnumHelper"

Use the recommended Forge version listed on the Pixelmon downloads page.


  • "java.lang.NoClassDefFoundError: cpw/mods/fml/relauncher/IFMLLoadingPlugin"

Don't use Minecraft 1.7.10 mods with Minecraft 1.8.


  • "java.lang.RuntimeException: org.lwjgl.LWJGLException: Could not create context (WGL_ARB_create_context)"

Open the "splash.properties" file in the config folder and disable the Forge splash screen.


  • "net.minecraftforge.fml.common.LoaderException: java.lang.ClassNotFoundException: com.pixelmonmod.pixelmon.Pixelmon"

Don't extract or unzip the Pixelmon jar. Place the jar itself in the mods folder instead.


  • "net.minecraftforge.fml.common.LoaderException: java.lang.IllegalAccessError: tried to access field net.minecraft.client.renderer.entity.RenderManager.field_178636_l from class com.pixelmonmod.pixelmon.client.ClientProxy"
  • "java.lang.IllegalAccessError: tried to access field net.minecraft.entity.projectile.EntityFishHook.field_146055_aB from class com.pixelmonmod.pixelmon.entities.projectiles.EntityHook"

If you are using Windows, rename the Pixelmon jar from ".jar.zip" to ".jar". If you do not see the ".zip" extension, you need to have extensions showing on your system; a tutorial on how to do so can be found here.

If you are using Mac OS X, do not unzip the Pixelmon jar. Place the jar itself in the mods folder instead.

Version 3.5.x

  • at java.nio.Buffer.checkIndex(Buffer.java:540)
  • at java.nio.DirectIntBufferU.get(Unknown Source)

Lower your render distance to 16 chunks or less.

  • "cpw.mods.fml.common.LoaderException: java.lang.NoClassDefFoundError: net/minecraftforge/event/world/BlockEvent$PlaceEvent"

Use the Forge version recommended on the Pixelmon downloads page.

  • "java.lang.OutOfMemoryError: Java heap space"
  • "java.lang.OutOfMemoryError: Initializing game"
  • "net.minecraft.client.renderer.StitcherException: Unable to fit: missingno - size: 16x16 - Maybe try a lowerresolution resourcepack?"

You haven't allocated enough memory to Minecraft. See Fixing memory issues for instructions about how to solve this issue.

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