ars magica ftb crash

2013-05-01 17:24:44 [INFO] [STDERR] Exception in thread "Minecraft main thread" java.lang.IllegalAccessError: tried to access field ll.J from class mithion.arsmagica.buffs.ArsMagicaBuffs
2013-05-01 17:24:44 [INFO] [STDERR] at mithion.arsmagica.buffs.ArsMagicaBuffs.createPotion(ArsMagicaBuffs.java:73)
2013-05-01 17:24:44 [INFO] [STDERR] at mithion.arsmagica.buffs.ArsMagicaBuffs.Init(ArsMagicaBuffs.java:94)
2013-05-01 17:24:44 [INFO] [STDERR] at mithion.arsmagica.AMCore.<init>(AMCore.java:124)
2013-05-01 17:24:44 [INFO] [STDERR] at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
2013-05-01 17:24:44 [INFO] [STDERR] at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
2013-05-01 17:24:44 [INFO] [STDERR] at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
2013-05-01 17:24:44 [INFO] [STDERR] at java.lang.reflect.Constructor.newInstance(Unknown Source)
2013-05-01 17:24:44 [INFO] [STDERR] at java.lang.Class.newInstance0(Unknown Source)
2013-05-01 17:24:44 [INFO] [STDERR] at java.lang.Class.newInstance(Unknown Source)
2013-05-01 17:24:44 [INFO] [STDERR] at cpw.mods.fml.common.FMLModContainer.constructMod(FMLModContainer.java:459)
2013-05-01 17:24:44 [INFO] [STDERR] at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
2013-05-01 17:24:44 [INFO] [STDERR] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
2013-05-01 17:24:44 [INFO] [STDERR] at java.lang.reflect.Method.invoke(Unknown Source)
2013-05-01 17:24:44 [INFO] [STDERR] at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:69)
2013-05-01 17:24:44 [INFO] [STDERR] at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
2013-05-01 17:24:44 [INFO] [STDERR] at com.google.common.eventbus.EventBus.dispatch(EventBus.java:317)
2013-05-01 17:24:44 [INFO] [STDERR] at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:300)
2013-05-01 17:24:44 [INFO] [STDERR] at com.google.common.eventbus.EventBus.post(EventBus.java:268)
2013-05-01 17:24:44 [INFO] [STDERR] at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:153)
2013-05-01 17:24:44 [INFO] [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
2013-05-01 17:24:44 [INFO] [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
2013-05-01 17:24:44 [INFO] [STDERR] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
2013-05-01 17:24:44 [INFO] [STDERR] at java.lang.reflect.Method.invoke(Unknown Source)
2013-05-01 17:24:44 [INFO] [STDERR] at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:69)
2013-05-01 17:24:44 [INFO] [STDERR] at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
2013-05-01 17:24:44 [INFO] [STDERR] at com.google.common.eventbus.EventBus.dispatch(EventBus.java:317)
2013-05-01 17:24:44 [INFO] [STDERR] at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:300)
2013-05-01 17:24:44 [INFO] [STDERR] at com.google.common.eventbus.EventBus.post(EventBus.java:268)
2013-05-01 17:24:44 [INFO] [STDERR] at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:86)
2013-05-01 17:24:44 [INFO] [STDERR] at cpw.mods.fml.common.Loader.loadMods(Loader.java:494)
2013-05-01 17:24:44 [INFO] [STDERR] at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:161)
2013-05-01 17:24:44 [INFO] [STDERR] at net.minecraft.client.Minecraft.a(Minecraft.java:412)
2013-05-01 17:24:44 [INFO] [STDERR] at asq.a(SourceFile:56)
2013-05-01 17:24:44 [INFO] [STDERR] at net.minecraft.client.Minecraft.run(Minecraft.java:746)
2013-05-01 17:24:44 [INFO] [STDERR] at java.lang.Thread.run(Unknown Source)