I was trying to run a server with serveral 1.4.7 mods. When I did I got this...

 

[iNFO] Starting minecraft server version 1.4.7

[iNFO] Loading properties

[iNFO] Default game type: SURVIVAL

[iNFO] Generating keypair

[iNFO] Starting Minecraft server on *:25565

[sEVERE] Encountered an unexpected exception LoaderException

cpw.mods.fml.common.LoaderException: java.lang.NoClassDefFoundError: ays

at cpw.mods.fml.common.LoadController.transition(LoadController.java:130)

at cpw.mods.fml.common.Loader.initializeMods(Loader.java:677)

at cpw.mods.fml.server.FMLServerHandler.finishServerLoading(FMLServerHandler.java:94)

at cpw.mods.fml.common.FMLCommonHandler.onServerStarted(FMLCommonHandler.java:356)

at ho.c(DedicatedServer.java:135)

at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:458)

at fy.run(SourceFile:849)

Caused by: java.lang.NoClassDefFoundError: ays

at net.neocromicon.src.ExtDecoRegisters.ExtDecoRegister.getExtDecoBlockAndItems(ExtDecoRegister.java:110)

at net.neocromicon.src.ExtDecoBase.ExtDecoMod.init(ExtDecoMod.java:222)

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:487)

at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:69)

at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)

at com.google.common.eventbus.EventBus.dispatch(EventBus.java:317)

at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:300)

at com.google.common.eventbus.EventBus.post(EventBus.java:268)

at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:153)

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.EventHandler.handleEvent(EventHandler.java:69)

at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)

at com.google.common.eventbus.EventBus.dispatch(EventBus.java:317)

at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:300)

at com.google.common.eventbus.EventBus.post(EventBus.java:268)

at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:86)

at cpw.mods.fml.common.Loader.initializeMods(Loader.java:676)

... 5 more

Caused by: java.lang.ClassNotFoundException: ays

at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:185)

at java.lang.ClassLoader.loadClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

... 32 more

Caused by: java.lang.NullPointerException

at org.objectweb.asm.ClassReader.<init>(Unknown Source)

at codechicken.core.asm.ClassHeirachyManager.transform(ClassHeirachyManager.java:80)

at cpw.mods.fml.relauncher.RelaunchClassLoader.runTransformers(RelaunchClassLoader.java:228)

at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:173)

... 34 more

[sEVERE] This crash report has been saved to: C:\Users\Alex\Desktop\Server\.\crash-reports\crash-2013-03-24_13.25.01-server.txt

 

I only get this error when I try to start the server with the mod Extended Decorations. Any help with this would be appreciated.

I suspect extendeddecorations is calling a client class on the server. Bug your mod author.

Thank you! It turns out the mod was client based. However, he gave me a dev version for SMP so yeah! Thanks again!