Client - Load up error

[Sir-Will]

Shows up in the client log:

[19:16:25] [Client thread/WARN] [cmw]: Attempting to load @Mod$Instance in class de.promolitor.copymultiplayerworld.CopyMultiplayerWorld for cmw and failing
java.lang.NoSuchFieldException: instance
    at java.lang.Class.getDeclaredField(Unknown Source) ~[?:1.8.0_92]
    at cpw.mods.fml.common.FMLModContainer.parseSimpleFieldAnnotation(FMLModContainer.java:404) [FMLModContainer.class:?]
    at cpw.mods.fml.common.FMLModContainer.processFieldAnnotations(FMLModContainer.java:358) [FMLModContainer.class:?]
    at cpw.mods.fml.common.FMLModContainer.constructMod(FMLModContainer.java:513) [FMLModContainer.class:?]
    at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source) ~[?:?]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_92]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_92]
    at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74) [guava-16.0.jar:?]
    at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47) [guava-16.0.jar:?]
    at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322) [guava-16.0.jar:?]
    at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304) [guava-16.0.jar:?]
    at com.google.common.eventbus.EventBus.post(EventBus.java:275) [guava-16.0.jar:?]
    at cpw.mods.fml.common.LoadController.sendEventToModContainer(LoadController.java:212) [LoadController.class:?]
    at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:190) [LoadController.class:?]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_92]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_92]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_92]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_92]
    at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74) [guava-16.0.jar:?]
    at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47) [guava-16.0.jar:?]
    at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322) [guava-16.0.jar:?]
    at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304) [guava-16.0.jar:?]
    at com.google.common.eventbus.EventBus.post(EventBus.java:275) [guava-16.0.jar:?]
    at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:119) [LoadController.class:?]
    at cpw.mods.fml.common.Loader.loadMods(Loader.java:513) [Loader.class:?]
    at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:208) [FMLClientHandler.class:?]
    at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:480) [bao.class:?]
    at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:878) [bao.class:?]
    at net.minecraft.client.main.Main.main(SourceFile:148) [Main.class:?]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_92]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_92]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_92]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_92]
    at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) [launchwrapper-1.11.jar:?]
    at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.11.jar:?]