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Relatively new to Minecraft. I have installed Forge for my client (forge-1.7.2-10.12.0.1034-universal). I kicked off the launcher using the Forge profile. Game starts and lists the 3 mods. The problem occurs when I attempt to implement the Fossil Archeology Mod.

I downloaded the mod zip (Fossil-Archaeology 1.5.2 Build 5.3). I have done several things in an attempt to get this to work. 1) Placed the .zip in the mods folder. 2) Extracted the contents of the .zip into the mods folder. Nothing works. The "mods.fossil.Fossil" exception led me to try restructuring my mods directory (mods/fossil/Fossil/mod_contents).

After installing Forge, the fossile instructions I found online say to place the mod in the mods folder. There are other suggestions to include the contents of the mod w/in the appropriate .jar. I have tried this as well. Is there a conflict with the version of minecraft and the version of the mod? Perhaps I am not respecting the contents of the .minecraft folder?

Any help is appreciated. Being a programmer (not so much Java) makes not being able to figure this out rather embarrassing.

Error report below:

/* --------------- */
cpw.mods.fml.common.LoaderException: java.lang.ClassNotFoundException: mods.fossil.Fossil
at cpw.mods.fml.common.LoadController.transition(LoadController.java:163)
at cpw.mods.fml.common.Loader.loadMods(Loader.java:494)
at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:201)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:498)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:853)
at net.minecraft.client.main.Main.main(SourceFile:103)
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:134)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
Caused by: java.lang.ClassNotFoundException: mods.fossil.Fossil
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:188)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at cpw.mods.fml.common.ModClassLoader.loadClass(ModClassLoader.java:58)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at cpw.mods.fml.common.FMLModContainer.constructMod(FMLModContainer.java:443)
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:47)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:314)
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:209)
at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:188)
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:47)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:314)
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:119)
at cpw.mods.fml.common.Loader.loadMods(Loader.java:484)
... 10 more
Caused by: java.lang.NoClassDefFoundError: cpw/mods/fml/common/network/IPacketHandler
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:180)
... 38 more
Caused by: java.lang.ClassNotFoundException: cpw.mods.fml.common.network.IPacketHandler
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:188)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 42 more
Caused by: java.lang.NullPointerException
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:180)
... 44 more


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

-- System Details --
Details:
Minecraft Version: 1.7.2
Operating System: Windows XP (x86) version 5.1
Java Version: 1.7.0_51, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
Memory: 45091912 bytes (43 MB) / 170881024 bytes (162 MB) up to 518979584 bytes (494 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v9.01-pre FML v7.2.125.1034 Minecraft Forge 10.12.0.1034 4 mods loaded, 4 mods active
mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed
FML{7.2.125.1034} [Forge Mod Loader] (forge-1.7.2-10.12.0.1034.jar) Unloaded->Constructed
Forge{10.12.0.1034} [Minecraft Forge] (forge-1.7.2-10.12.0.1034.jar) Unloaded->Constructed
fossil{1.5.2 Build 5.3} [Fossil/Archeology] (Fossil-Archaeology 1.5.2 Build 5.3 (1).zip) Unloaded->Errored
/* ----------- */

Quote from Wedgenator

Fossil-Archaeology 1.5.2 Build 5.3

That's your problem, you're using the 1.5.2 version of it.
Made for Minecraft 1.5.2 not 1.7.2.

Quote from Fixided

That's your problem, you're using the 1.5.2 version of it.
Made for Minecraft 1.5.2 not 1.7.2.

Thanks Fixided. You are right. I was able to launch 1.5.2, install Forge, and play the mod. I thought I had tried that...guess not. The download link did say it would work on 1.7.4 and 1.6.4. I did see the mod version was different but wasn't convinced it referred to the minecraft version. Thanks again!

Quote from Wedgenator

Thanks Fixided. You are right. I was able to launch 1.5.2, install Forge, and play the mod. I thought I had tried that...guess not. The download link did say it would work on 1.7.4 and 1.6.4. I did see the mod version was different but wasn't convinced it referred to the minecraft version. Thanks again!

You got tricked by the Third-Party Site Demons.

Scoop.it, Minecraft5, 9Minecraft
Demons made to crash your Minecraft experience.

I hate them so much....

(On topic!)
The Technic Launcher's new modpack called "Attack Of The B-Team"
actually ported the mod to 1.6.4

You could use that mod instead.

Hope I was Helpful