I just finished working on a mod and was working fine in the Dev environment so I decided to test it with a release. The compiling and reobfuscating all seemed to go well but when I go to load the mod is give me a ClassNotFoundException for my main class and I can look through the files and see it sitting right there where it's suppose to be.

Error log please

cpw.mods.fml.common.LoaderException: java.lang.ClassNotFoundException: bigbaddevil7.supernova.SuperNova

at cpw.mods.fml.common.LoadController.transition(LoadController.java:156)

at cpw.mods.fml.common.Loader.loadMods(Loader.java:521)

at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:183)

at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:473)

at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:808)

at net.minecraft.client.main.Main.main(SourceFile:101)

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 net.minecraft.launchwrapper.Launch.launch(Launch.java:131)

at net.minecraft.launchwrapper.Launch.main(Launch.java:27)

Caused by: java.lang.ClassNotFoundException: bigbaddevil7.supernova.SuperNova

at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:186)

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

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

at cpw.mods.fml.common.ModClassLoader.loadClass(ModClassLoader.java:61)

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

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

at cpw.mods.fml.common.FMLModContainer.constructMod(FMLModContainer.java:462)

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:74)

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

at com.google.common.eventbus.EventBus.dispatch(EventBus.java:313)

at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)

at com.google.common.eventbus.EventBus.post(EventBus.java:267)

at cpw.mods.fml.common.LoadController.sendEventToModContainer(LoadController.java:201)

at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:181)

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:74)

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

at com.google.common.eventbus.EventBus.dispatch(EventBus.java:313)

at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)

at com.google.common.eventbus.EventBus.post(EventBus.java:267)

at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:112)

at cpw.mods.fml.common.Loader.loadMods(Loader.java:511)

... 10 more

Caused by: java.lang.NullPointerException

at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:178)

... 38 more

 

 

A detailed walkthrough of the error, its code path and all known details is as follows:

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-- System Details --

Details:

Minecraft Version: 1.6.4

Operating System: Windows 8 (amd64) version 6.2

Java Version: 1.7.0_51, Oracle Corporation

Java VM Version: Java HotSpot 64-Bit Server VM (mixed mode), Oracle Corporation

Memory: 143568904 bytes (136 MB) / 475004928 bytes (453 MB) up to 954728448 bytes (910 MB)

JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G

AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used

Suspicious classes: FML and Forge are installed

IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0

FML: MCP v8.11 FML v6.4.49.965 Minecraft Forge 9.11.1.965 4 mods loaded, 4 mods active

mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed

FML{6.4.49.965} [Forge Mod Loader] (minecraftforge-9.11.1.965.jar) Unloaded->Constructed

Forge{9.11.1.965} [Minecraft Forge] (minecraftforge-9.11.1.965.jar) Unloaded->Constructed

SuperNova{0.0.1 Dev} [superNova] (bigbaddevil7) Unloaded->Errored

Try running

gradlew --refresh-dependencies build

If that doesn't fix it, then you are probably trying to access your SuperNova class / method on the server side when it is client-side only; at least, if it is client-side only.

I figured out the problem I'm using winrar and i forgot that that makes an archive instead of a zip. Don't like that don't have two different Icon for the file formats. Loaded fine after that..