java.lang.IllegalAccessError: tried to access field net.minecraftforge.common.config.Property.comment from class vazkii.psi.common.core.handler.ConfigHandler
    at vazkii.psi.common.core.handler.ConfigHandler.loadPropBool(ConfigHandler.java:94) ~[ConfigHandler.class:?]
    at vazkii.psi.common.core.handler.ConfigHandler.load(ConfigHandler.java:48) ~[ConfigHandler.class:?]
    at vazkii.psi.common.core.handler.ConfigHandler.init(ConfigHandler.java:39) ~[ConfigHandler.class:?]
    at vazkii.psi.common.core.proxy.CommonProxy.preInit(CommonProxy.java:40) ~[CommonProxy.class:?]
    at vazkii.psi.client.core.proxy.ClientProxy.preInit(ClientProxy.java:50) ~[ClientProxy.class:?]
    at vazkii.psi.common.Psi.preInit(Psi.java:35) ~[Psi.class:?]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_71]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_71]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_71]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_71]
    at net.minecraftforge.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:560) ~[forge-1.9-12.16.0.1809-1.9.jar:?]
    at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source) ~[?:?]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_71]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_71]
    at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74) ~[guava-17.0.jar:?]
    at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47) ~[guava-17.0.jar:?]
    at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322) ~[guava-17.0.jar:?]
    at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304) ~[guava-17.0.jar:?]
    at com.google.common.eventbus.EventBus.post(EventBus.java:275) ~[guava-17.0.jar:?]
    at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:221) ~[forge-1.9-12.16.0.1809-1.9.jar:?]
    at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:199) ~[forge-1.9-12.16.0.1809-1.9.jar:?]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_71]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_71]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_71]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_71]
    at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74) ~[guava-17.0.jar:?]
    at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47) ~[guava-17.0.jar:?]
    at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322) ~[guava-17.0.jar:?]
    at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304) ~[guava-17.0.jar:?]
    at com.google.common.eventbus.EventBus.post(EventBus.java:275) ~[guava-17.0.jar:?]
    at net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:128) [LoadController.class:?]
    at net.minecraftforge.fml.common.Loader.preinitializeMods(Loader.java:556) [Loader.class:?]
    at net.minecraftforge.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:240) [FMLClientHandler.class:?]
    at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:434) [bcf.class:?]
    at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:346) [bcf.class:?]
    at net.minecraft.client.main.Main.main(SourceFile:124) [Main.class:?]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_71]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_71]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_71]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_71]
    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:?]