java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException: 	at mytown.config.json.RanksConfig.validate(RanksConfig.java:48)	at mytown.config.json.RanksConfig.validate(RanksConfig.java:11)	at myessentials.json.api.JsonConfig.read(JsonConfig.java:99)	at mytown.config.json.RanksConfig.read(RanksConfig.java:33)	at mytown.config.json.RanksConfig.read(RanksConfig.java:11)	at myessentials.json.api.JsonConfig.init(JsonConfig.java:49)	at myessentials.json.api.JsonConfig.init(JsonConfig.java:33)	at mytown.MyTown.serverStarting(MyTown.java:90)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at cpw.mods.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:532)	at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74)	at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)	at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)	at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)	at com.google.common.eventbus.EventBus.post(EventBus.java:275)	at cpw.mods.fml.common.LoadController.sendEventToModContainer(LoadController.java:212)	at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:190)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74)	at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)	at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)	at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)	at com.google.common.eventbus.EventBus.post(EventBus.java:275)	at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:119)	at cpw.mods.fml.common.Loader.serverStarting(Loader.java:789)	at cpw.mods.fml.common.FMLCommonHandler.handleServerStarting(FMLCommonHandler.java:282)	at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:368)	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:643)	at java.lang.Thread.run(Unknown Source)