Console : 2013-08-14 23:22:02 [INFO] java.lang.ClassNotFoundException: biomesoplenty.mobs.EntityJungleSpider
Console : 2013-08-14 23:22:02 [INFO] at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:238)
Console : 2013-08-14 23:22:02 [INFO] at java.lang.ClassLoader.loadClass(Unknown Source)
Console : 2013-08-14 23:22:02 [INFO] at java.lang.ClassLoader.loadClass(Unknown Source)
Console : 2013-08-14 23:22:02 [INFO] at java.lang.Class.forName0(Native Method)
Console : 2013-08-14 23:22:02 [INFO] at java.lang.Class.forName(Unknown Source)
Console : 2013-08-14 23:22:02 [INFO] at powercrystals.minefactoryreloaded.modhelpers.biomesoplenty.BiomesOPlenty.load(BiomesOPlenty.java:119)
Console : 2013-08-14 23:22:02 [INFO] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
Console : 2013-08-14 23:22:02 [INFO] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
Console : 2013-08-14 23:22:02 [INFO] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
Console : 2013-08-14 23:22:02 [INFO] at java.lang.reflect.Method.invoke(Unknown Source)
Console : 2013-08-14 23:22:02 [INFO] at cpw.mods.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:494)
Console : 2013-08-14 23:22:02 [INFO] at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
Console : 2013-08-14 23:22:02 [INFO] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
Console : 2013-08-14 23:22:02 [INFO] at java.lang.reflect.Method.invoke(Unknown Source)
Console : 2013-08-14 23:22:02 [INFO] at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:74)
Console : 2013-08-14 23:22:02 [INFO] at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
Console : 2013-08-14 23:22:02 [INFO] at com.google.common.eventbus.EventBus.dispatch(EventBus.java:314)
Console : 2013-08-14 23:22:02 [INFO] at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)
Console : 2013-08-14 23:22:02 [INFO] at com.google.common.eventbus.EventBus.post(EventBus.java:267)
Console : 2013-08-14 23:22:02 [INFO] at cpw.mods.fml.common.LoadController.sendEventToModContainer(LoadController.java:192)
Console : 2013-08-14 23:22:02 [INFO] at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:172)
Console : 2013-08-14 23:22:02 [INFO] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
Console : 2013-08-14 23:22:02 [INFO] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
Console : 2013-08-14 23:22:02 [INFO] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
Console : 2013-08-14 23:22:02 [INFO] at java.lang.reflect.Method.invoke(Unknown Source)
Console : 2013-08-14 23:22:02 [INFO] at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:74)
Console : 2013-08-14 23:22:02 [INFO] at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
Console : 2013-08-14 23:22:02 [INFO] at com.google.common.eventbus.EventBus.dispatch(EventBus.java:314)
Console : 2013-08-14 23:22:02 [INFO] at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)
Console : 2013-08-14 23:22:02 [INFO] at com.google.common.eventbus.EventBus.post(EventBus.java:267)
Console : 2013-08-14 23:22:02 [INFO] at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:103)
Console : 2013-08-14 23:22:02 [INFO] at cpw.mods.fml.common.Loader.initializeMods(Loader.java:691)
Console : 2013-08-14 23:22:02 [INFO] at cpw.mods.fml.server.FMLServerHandler.finishServerLoading(FMLServerHandler.java:93)
Console : 2013-08-14 23:22:02 [INFO] at cpw.mods.fml.common.FMLCommonHandler.onServerStarted(FMLCommonHandler.java:355)
Console : 2013-08-14 23:22:02 [INFO] at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:141)
Console : 2013-08-14 23:22:02 [INFO] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:431)
Console : 2013-08-14 23:22:02 [INFO] at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:573)
Console : 2013-08-14 23:22:02 [INFO] Caused by: java.lang.NullPointerException
Console : 2013-08-14 23:22:02 [INFO] at org.objectweb.asm.ClassReader.(Unknown Source)
Console : 2013-08-14 23:22:02 [INFO] at miscperipherals.asm.ImplementIfLoadedTransformer.transform(ImplementIfLoadedTransformer.java:19)
Console : 2013-08-14 23:22:02 [INFO] at cpw.mods.fml.relauncher.RelaunchClassLoader.runTransformers(RelaunchClassLoader.java:352)
Console : 2013-08-14 23:22:02 [INFO] at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:225)
Console : 2013-08-14 23:22:02 [INFO] ... 36 more

That's a bug on the MFR end - they still have old compatibility on their end. Nothing we can do with it.