Hello, I've decided to attempt to get into modding and such so after following a few tutorials I've attempted to produce my own, and it works perfectly in eclipse but not in an actual client. The mod is basically a new ore and some tools so nothing to complicated and i was wondering if i could get some help, Can post source if needed.

 

Here is the error:

 

 

cpw.mods.fml.common.LoaderException: java.lang.ClassNotFoundException: mod_slippersite.mod_slippersite

at cpw.mods.fml.common.LoadController.transition(LoadController.java:102)

at cpw.mods.fml.common.Loader.loadMods(Loader.java:467)

at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:146)

at net.minecraft.client.Minecraft.a(Minecraft.java:416)

at net.minecraft.client.Minecraft.run(Minecraft.java:748)

at java.lang.Thread.run(Unknown Source)

Caused by: java.lang.ClassNotFoundException: mod_slippersite.mod_slippersite

at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:125)

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

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

at cpw.mods.fml.common.ModClassLoader.loadClass(ModClassLoader.java:57)

at java.lang.Class.forName0(Native Method)

at java.lang.Class.forName(Unknown Source)

at cpw.mods.fml.common.FMLModContainer.constructMod(FMLModContainer.java:407)

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.propogateStateMessage(LoadController.java:124)

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:81)

at cpw.mods.fml.common.Loader.loadMods(Loader.java:466)

... 4 more

Caused by: java.lang.NullPointerException

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

at cpw.mods.fml.common.asm.transformers.SideTransformer.transform(SideTransformer.java:27)

at cpw.mods.fml.relauncher.RelaunchClassLoader.runTransformers(RelaunchClassLoader.java:162)

at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:118)

... 31 more

--- END ERROR REPORT f3fcadad ----------

 

 

 

And Yes, I the vain fool, Slicedslippers, Named it Slippersite.

 

Many thanks, SlicedSlippers 

Okay, so what are you doing to test in the client?

 

Maybe this helps you to find what's missing: I run the recompile and reobfuscate scripts and then pack the contents of reobf/minecraft (the minecraft folder should not be included) and put that inside the mods folder.

Well Jeeze, this entire time I've been Zipping up the wrong folder, I feel really stupid. as soon as I attempted to zip up the two folders that the were inside of the minecraft folder that was created by reobf, it worked! Thanks for helping a noob in the truest sense of the word! 

 

 

I feel really stupid

 

It must be a common mistake, I also did that the first time I packed my mod. I noticed it was wrong because I packed it in a jar, so I figured it should be looking for "minecraft.mod_name.mod_name" instead.