1.6.4 launch fail after install

[bauch1234]

Minecraft version: 1.6.4

SecretRoomsMod version: 4.6.2.309 and 4.6.2.307 caused same error

MinecraftForge version: 9.11.1.917

MinecraftForums username: bauch1234

---- Minecraft Crash Report ----
// Shall we play a game?

Time: 11/2/13 7:00 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: com.github.AbrarSyed.secretroomsmod.common.SecretRooms
at cpw.mods.fml.common.LoadController.transition(LoadController.java:149)
at cpw.mods.fml.common.Loader.loadMods(Loader.java:520)
at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:183)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:472)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:807)
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: com.github.AbrarSyed.secretroomsmod.common.SecretRooms
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:194)
at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:174)
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:105)
at cpw.mods.fml.common.Loader.loadMods(Loader.java:510)
... 10 more
Caused by: java.lang.UnsupportedClassVersionError: com/github/AbrarSyed/secretroomsmod/common/SecretRooms : Unsupported major.minor version 51.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
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:

-- System Details --
Details:
Minecraft Version: 1.6.4
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.6.0_20, Sun Microsystems Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
Memory: 182562840 bytes (174 MB) / 425000960 bytes (405 MB) up to 954466304 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 v6.4.21.917 Minecraft Forge 9.11.1.917 21 mods loaded, 21 mods active
mcp{8.09} Minecraft Coder Pack Unloaded->Constructed
FML{6.4.21.917} Forge Mod Loader Unloaded->Constructed
Forge{9.11.1.917} Minecraft Forge Unloaded->Constructed
CodeChickenCore{0.9.0.6} CodeChicken Core Unloaded->Constructed
NotEnoughItems{1.6.1.5} Not Enough Items Unloaded->Constructed
BuildCraft|Core{4.1.0} BuildCraft Unloaded->Constructed
BuildCraft|Builders{4.1.0} BC Builders Unloaded->Constructed
BuildCraft|Energy{4.1.0} BC Energy Unloaded->Constructed
BuildCraft|Factory{4.1.0} BC Factory Unloaded->Constructed
BuildCraft|Transport{4.1.0} BC Transport Unloaded->Constructed
BuildCraft|Silicon{4.1.0} BC Silicon Unloaded->Constructed
Railcraft{8.1.0.0} Railcraft Unloaded->Constructed
secretroomsmod{4.6.2} The SecretRoomsMod Unloaded->Errored
TorchLevers{1.3.2} Torch Levers Unloaded->Constructed
WebDisplay{0.7} Web Displays Unloaded->Constructed
ForgeMultipart{1.0.0.182} Forge Multipart Unloaded->Constructed
WR-CBE|Core{1.4.0.6} [WR-CBE Core](WR-CBE 1.4.0.6.jar) Unloaded->Constructed
WR-CBE|Addons{1.4.0.6} [WR-CBE Addons](WR-CBE 1.4.0.6.jar) Unloaded->Constructed
WR-CBE|Logic{1.4.0.6} [WR-CBE Logic](WR-CBE 1.4.0.6.jar) Unloaded->Constructed
McMultipart{1.0.0.182} Minecraft Multipart Plugin Unloaded->Constructed
ForgeMicroblock{1.0.0.182} Forge Microblocks Unloaded->Constructed

[AbrarSyed]

fixed.