# Awesomehunter46/secret-Rooms-mod-error > Hey. I run a mac. I puth the secret rooms mod jar into the mods folder and clicked play. Thiss is what happened. After looking at other posts i updated my java. it still says i have 1.60.06 or something. Pls help.---- Minecraft Crash Report ---- // Hey, that tickles! Hehehe! Time: 10/21/13 6:43 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:519) 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(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) 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(ClassLoader.java:306) at java.lang.ClassLoader.loadClass(ClassLoader.java:247) at cpw.mods.fml.common.ModClassLoader.loadClass(ModClassLoader.java:59) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:249) at cpw.mods.fml.common.FMLModContainer.constructMod(FMLModContainer.java:462) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) 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(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) 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:509) ... 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(ClassLoader.java:637) at java.lang.ClassLoader.defineClass(ClassLoader.java:621) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141) 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: Mac OS X (x86_64) version 10.8.5 Java Version: 1.6.0_65, Apple Inc. Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc. Memory: 45113744 bytes (43 MB) / 136269824 bytes (129 MB) up to 1065025536 bytes (1015 MB) JVM Flags: 1 total; -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 v6.4.20.916 Minecraft Forge 9.11.1.916 5 mods loaded, 5 mods active mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed FML{6.4.20.916} [Forge Mod Loader] (minecraftforge-9.11.1.916.jar) Unloaded->Constructed Forge{9.11.1.916} [Minecraft Forge] (minecraftforge-9.11.1.916.jar) Unloaded->Constructed TooManyItems{1.6.4} [TooManyItems] (minecraft.jar) Unloaded->Constructed secretroomsmod{4.6.2} [The SecretRoomsMod] (SecretRoomsMod-universal-1-1.6.4-4.6.2.309.jar) Unloaded->Errored - **Canonical URL**: https://githubrepo.cloud/repo/Awesomehunter46/secret-Rooms-mod-error - **GitHub Repository**: https://github.com/Awesomehunter46/secret-Rooms-mod-error - **Maintainer / Creator**: https://github.com/Awesomehunter46 - **Discovered On**: Sep 29, 2026 --- *Indexed by GitHubRepo (https://githubrepo.cloud). 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