1.12.2 entity has a duplicate stat with launching

[ijdtm7]

when I try to launch my game crashes after I implemented an entity, this is the error

 

Exception caught during firing event net.minecraftforge.event.RegistryEvent$Register@7ffb99da: java.lang.RuntimeException: Duplicate stat id: "TranslatableComponent{key='stat.entityKill', args=[TranslatableComponent{key='entity.scp999.name', args=[], siblings=[], style=Style{hasParent=true, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null, insertion=null}}], siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null, insertion=null}}" and "TranslatableComponent{key='stat.entityKill', args=[TranslatableComponent{key='entity.scp999.name', args=[], siblings=[], style=Style{hasParent=true, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null, insertion=null}}], siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null, insertion=null}}" at id stat.killEntity.scp999    at net.minecraft.stats.StatBase.registerStat(StatBase.java:133
) ~[StatBase.class:?]    at net.minecraftforge.fml.common.registry.EntityEntryBuilder.registerStatistics(EntityEntryBuilder.java:286
) ~[EntityEntryBuilder.class:?]    at net.minecraftforge.fml.common.registry.EntityEntryBuilder.access$100(EntityEntryBuilder.java:58
) ~[EntityEntryBuilder.class:?]    at net.minecraftforge.fml.common.registry.EntityEntryBuilder$BuiltEntityEntry.addedToRegistry(EntityEntryBuilder.java:336
) ~[EntityEntryBuilder$BuiltEntityEntry.class:?]    at net.minecraftforge.registries.GameData$EntityCallbacks.onAdd(GameData.java:474
) ~[GameData$EntityCallbacks.class:?]    at net.minecraftforge.registries.GameData$EntityCallbacks.onAdd(GameData.java:465
) ~[GameData$EntityCallbacks.class:?]    at net.minecraftforge.registries.ForgeRegistry.add(ForgeRegistry.java:358
) ~[ForgeRegistry.class:?]    at net.minecraftforge.registries.ForgeRegistry.add(ForgeRegistry.java:289
) ~[ForgeRegistry.class:?]    at net.minecraftforge.registries.ForgeRegistry.register(ForgeRegistry.java:122
) ~[ForgeRegistry.class:?]    at net.minecraftforge.registries.ForgeRegistry.registerAll(ForgeRegistry.java:163
) ~[ForgeRegistry.class:?]    at net.mcreator.sez.sez.registerEntities(sez.java:176
) ~[sez.class:?]    at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_47_sez_registerEntities_Register.invoke(.dynamic) ~[?:?]    at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90
) ~[ASMEventHandler.class:?]    at net.minecraftforge.fml.common.eventhandler.EventBus$1.invoke(EventBus.java:144
) ~[EventBus$1.class:?]    at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:182
) [EventBus.class:?]    at net.minecraftforge.registries.GameData.fireRegistryEvents(GameData.java:789
) [GameData.class:?]    at net.minecraftforge.fml.common.Loader.preinitializeMods(Loader.java:628
) [Loader.class:?]    at net.minecraftforge.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:252
) [FMLClientHandler.class:?]    at net.minecraft.client.Minecraft.init(Minecraft.java:513
) [Minecraft.class:?]    at net.minecraft.client.Minecraft.run(Minecraft.java:421
) [Minecraft.class:?]    at net.minecraft.client.main.Main.main(Main.java:118
) [Main.class:?]    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_212]    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62
) ~[?:1.8.0_212]    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43
) ~[?:1.8.0_212]    at java.lang.reflect.Method.invoke(Method.java:498
) ~[?:1.8.0_212]    at net.minecraft.launchwrapper.Launch.launch(Launch.java:135
) [launchwrapper-1.12.jar:?]    at net.minecraft.launchwrapper.Launch.main(Launch.java:28
) [launchwrapper-1.12.jar:?]    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_212]    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62
) ~[?:1.8.0_212]    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43
) ~[?:1.8.0_212]    at java.lang.reflect.Method.invoke(Method.java:498
) ~[?:1.8.0_212]    at net.minecraftforge.gradle.GradleStartCommon.launch(GradleStartCommon.java:97
) [start/:?]    at GradleStart.main(GradleStart.java:25
) [start/:?]

[superminerJG]

BTW, crash logs aren't enough. Do you happen to have the source code on GitHub? It would help quite a bit.

Edited July 8, 2019 by superminerJG
messed up