---- Minecraft Crash Report ----
// Quite honestly, I wouldn't worry myself about that.

Time: 5/11/15 5:07 PM
Description: There was a severe problem during mod loading that has caused the game to fail

cpw.mods.fml.common.LoaderException: java.lang.ClassNotFoundException: darkknight.jewelrycraft.JewelrycraftMod
at cpw.mods.fml.common.LoadController.transition(LoadController.java:163)
at cpw.mods.fml.common.Loader.loadMods(Loader.java:522)
at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:206)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:480)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:878)
at net.minecraft.client.main.Main.main(SourceFile:148)
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:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
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 org.multimc.onesix.OneSixLauncher.launchWithMainClass(OneSixLauncher.java:273)
at org.multimc.onesix.OneSixLauncher.launch(OneSixLauncher.java:363)
at org.multimc.EntryPoint.listen(EntryPoint.java:165)
at org.multimc.EntryPoint.main(EntryPoint.java:54)
Caused by: java.lang.ClassNotFoundException: darkknight.jewelrycraft.JewelrycraftMod
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
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:440)
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.EventSubscriber.handleEvent(EventSubscriber.java:74)
at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)
at com.google.common.eventbus.EventBus.post(EventBus.java:275)
at cpw.mods.fml.common.LoadController.sendEventToModContainer(LoadController.java:212)
at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:190)
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.EventSubscriber.handleEvent(EventSubscriber.java:74)
at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)
at com.google.common.eventbus.EventBus.post(EventBus.java:275)
at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:119)
at cpw.mods.fml.common.Loader.loadMods(Loader.java:511)
... 18 more
Caused by: java.lang.UnsupportedClassVersionError: darkknight/jewelrycraft/JewelrycraftMod : Unsupported major.minor version 52.0
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:182)
... 46 more

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

-- System Details --
Details:
Minecraft Version: 1.7.10
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_75, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 255826432 bytes (243 MB) / 510066688 bytes (486 MB) up to 1020067840 bytes (972 MB)
JVM Flags: 19 total; -XX:NewRatio=3 -XX:SurvivorRatio=3 -XX:TargetSurvivorRatio=80 -XX:MaxTenuringThreshold=8 -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:MaxGCPauseMillis=10 -XX:GCPauseIntervalMillis=50 -XX:MaxGCMinorPauseMillis=7 -XX:+ExplicitGCInvokesConcurrent -XX:+UseCMSInitiatingOccupancyOnly -XX:CMSInitiatingOccupancyFraction=75 -XX:+BindGCTaskThreadsToCPUs -Xnoclassgc -XX:-UseFastAccessorMethods -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xms512m -Xmx1024m -XX:PermSize=128m
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 v9.05 FML v7.10.141.1403 Minecraft Forge 10.13.3.1403 Optifine OptiFine_1.7.10_HD_U_B7 47 mods loaded, 47 mods active
mcp{9.05} Minecraft Coder Pack Unloaded->Constructed
FML{7.10.141.1403} Forge Mod Loader Unloaded->Constructed
Forge{10.13.3.1403} Minecraft Forge Unloaded->Constructed
CodeChickenCore{1.0.6.43} CodeChicken Core Unloaded->Constructed
NotEnoughItems{1.0.4.106} Not Enough Items Unloaded->Constructed
VeinMiner_coremod{0.27.1_build.unknown} Core mod Unloaded->Constructed
jewelrycraft2{1.0.9} [Jewelrycraft 2]([1.7.10] Jewelrycraft2-1.0.9-universal.jar) Unloaded->Errored
DamageIndicatorsMod{3.2.0} Damage Indicators Unloaded->Constructed
deconstruction{2.2.5} The Deconstruction Mod Unloaded->Constructed
AdvancedHUD{Version [0.1.8] for 1.7.10} AdvancedHUD Unloaded->Constructed
adventurebackpack{1.7.10-0.8b} Adventure Backpack Unloaded->Constructed
attainedDrops{1.3} Attained Drops Unloaded->Constructed
atum{0.6} Atum Unloaded->Constructed
ChickenChunks{1.3.4.19} ChickenChunks Unloaded->Constructed
chocolateQuest{1.0} Chocolate Quest Unloaded->Constructed
claydolls{0.9} [claydolls](Clay Dolls Mod V0.9-1.7.10.jar) Unloaded->Constructed
colourfulportalsmod{1.4.3} Colourful Portals Unloaded->Constructed
CosmeticArmor{1.0.5} Cosmetic Armor Unloaded->Constructed
DLDungeonsJBG{1.7.5} Doomlike Dungeons Unloaded->Constructed
dungeonpack{1.7.10-1.0} Dungeon Pack Unloaded->Constructed
eplus{3.0.2-d} Enchanting Plus Unloaded->Constructed
EnderIO{1.7.10-2.2.8.367} Ender IO Unloaded->Constructed
EnderZoo{1.7.10-1.0.11.28} Ender Zoo Unloaded->Constructed
extfar{1.7.10-4.0} Extended Farming Unloaded->Constructed
FastCraft{1.21} FastCraft Unloaded->Constructed
fossil{1.7.10 Build 7.1.0} Fossils and Archeology Revival Unloaded->Constructed
GrimoireOfGaia{1.0.0} Grimoire of Gaia 3 Unloaded->Constructed
HelpFixer{1.0.7} HelpFixer Unloaded->Constructed
InventoryPets{1.1.1} Inventory Pets Unloaded->Constructed
inventorytweaks{1.59-dev-152-cf6e263} Inventory Tweaks Unloaded->Constructed
keysoverhaul{1.0} Key Bindings Overhaul Unloaded->Constructed
LotsOfFood{1.7.10} [Lots of Food](Lots of Food-1.7.10 v7.jar) Unloaded->Constructed
recipemod{0.2} NoMoreRecipeConflict Unloaded->Constructed
quantumflux{1.1.0} QuantumFlux Unloaded->Constructed
shadowworld{1.3.3} Shadow World Unloaded->Constructed
soundfilters{0.8_for_1.7.X} Sound Filters Unloaded->Constructed
RioVII{v1.1.4} [The Mists of RioV II](The Mists of RioV II - v1.1.4.jar) Unloaded->Constructed
erebus{0.2a} Erebus Unloaded->Constructed
Torcherino{1.9s} Torcherino Unloaded->Constructed
TragicMC{2.43.2375 Beta} TragicMC 2 Unloaded->Constructed
TwilightForest{2.3.5} The Twilight Forest Unloaded->Constructed
VeinMiner{0.27.1_build.unknown} Vein Miner Unloaded->Constructed
VeinMinerModSupport{0.27.1_build.unknown} Mod Support Unloaded->Constructed
VersionChecker{1.1.8} Version Checker Unloaded->Constructed
Waila{1.5.10} Waila Unloaded->Constructed
WailaHarvestability{1.1.2} Waila Harvestability Unloaded->Constructed
XaeroMinimap{1.4.5} Xaero's Minimap Unloaded->Constructed

I looked at this and seriously have no idea as to what could be causing it. The error claims the file JewelrycraftMod is missing, which is false, because if it were true everybody would be having the same issue.

Why the fml load darkknight.jewelrycraft.JewelrycraftMod but the class have only this
package darkknight.jewelrycraft;

Oh wow, I think I might know the problem. You should probably have forge installed, nobody uses FML anymore. Dunno if that really is the problem, but please try it.

I have Forge installed (1403), I did an experiment: replace the class of 1.0.9 with the old 1.0.8, but the problem still remains, now I know the problem it's in the new code. I'm using the 1.0.8 (laggy) and works perfectly.

Can you try it with the curse launcher or normal Minecraft launcher and tell me if it does the same thing? Because I tested it with those and it should. I have also tested using MultiMc and it worked just fine. I had created a new instanced with same forge version as you and added my mod and everything was fine. I assume the problem relies on another mod, not mine.

Note: I am pretty sure you aren't supposed to have both FML AND Forge installed at the same time. Please remove FML and try again.

Sor1n, it looks like you built the mod for Java 8, while igoutta is running Java 7 from MultiMC, which doesn't automatically use Java 8 like the vanilla launcher.

Interesting.

Ok then, so update to Java 8, please :3 Also I thought Java 7 is compatible with Java 8, but I guess not.

I'm going to close the issue if Java 7 was the problem. Just use Java 8 and everything will be fine.

Last comment: Edit in curseforge the avalaible versions of Java for the file, that's was the first problem in fact.

Ok ;)