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java.lang.IllegalArgumentException when trying to make first entity (1.8)


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I am trying to make my first entity ( 1.8 )  but when I run the client I get this message:


"java.lang.IllegalArgumentException: Can not set static com.kingarthur.elementalswords.ClientProxy field com.kingarthur.elementalswords.ClientProxy.modInstance to com.kingarthur.elementalswords.Main"


This is the relevant code in my client proxy:


public class ClientProxy extends CommonProxy {



public static ClientProxy modInstance;



public void preInit(FMLPreInitializationEvent e) {





public void init(FMLInitializationEvent e) {






And this is the code in my ModEntities file:


public class ModEntities {


public static void mainRegistry() {




public static void registerEntity() {


                createEntity(EntityFireGuardian.class, "Guardian of Fire", 0xF20505, 0xD8DE31);



public static void createEntity(Class entityClass, String entityName, int solidColor, int spotColor) {


                int randomId = EntityRegistry.findGlobalUniqueEntityId();


EntityRegistry.registerGlobalEntityID(entityClass, entityName, randomId);


EntityRegistry.registerModEntity(entityClass, entityName, randomId,

                ClientProxy.modInstance, 80, 3, true);


createEgg(randomId, solidColor, spotColor);



private static void createEgg(int randomId, int solidColor, int spotColor) {


                EntityList.entityEggs.put(Integer.valueOf(randomId), new EntityList.EntityEggInfo(

                randomId, solidColor, spotColor));



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The field with the


annotation needs to be the same type as your main mod class (the one with the


annotation), since it holds the instance of that class.


Why are you doing this in


? Entities need to be registered on both sides.


There's no reason to use global entity IDs (


) or manually add spawn eggs in 1.8, if you need a spawn egg just call the


overload with the two extra


parameters (the background and foreground colours of the egg).

Please don't PM me to ask for help. Asking your question in a public thread preserves it for people who are having the same problem in the future.

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