I got the same problem. Create a folder called 1.7.10, and put mods for that version in there. Then create a folder called 1.8, and put all the mods for that version in there. Don't put any mods directly in the mods folder. Then when you load each version, it will take the mods from that folder.
Rollback Post to RevisionRollBack
There are 10 types of people in the world. Those that understand binary and those that don't.
Here's the launcher log:
[13:38:56] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[13:38:56] [main/INFO] [LaunchWrapper]: Using primary tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[13:38:56] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLTweaker
[13:38:56] [main/INFO] [FML]: Forge Mod Loader version 8.99.124.1450 for Minecraft 1.8 loading
[13:38:56] [main/INFO] [FML]: Java is Java HotSpot(TM) 64-Bit Server VM, version 1.6.0_65, running on Mac OS X:x86_64:10.10.1, installed at /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:461]: java.lang.NoClassDefFoundError: cpw/mods/fml/relauncher/IFMLLoadingPlugin
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at java.lang.ClassLoader.defineClass1(Native Method)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at java.lang.ClassLoader.defineClassCond(ClassLoader.java:637)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at java.security.AccessController.doPrivileged(Native Method)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:117)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at java.lang.Class.forName0(Native Method)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at java.lang.Class.forName(Class.java:249)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraftforge.fml.relauncher.CoreModManager.loadCoreMod(CoreModManager.java:447)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraftforge.fml.relauncher.CoreModManager.discoverCoreMods(CoreModManager.java:371)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraftforge.fml.relauncher.CoreModManager.handleLaunch(CoreModManager.java:239)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraftforge.fml.relauncher.FMLLaunchHandler.setupHome(FMLLaunchHandler.java:90)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraftforge.fml.relauncher.FMLLaunchHandler.setupClient(FMLLaunchHandler.java:67)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraftforge.fml.relauncher.FMLLaunchHandler.configureForClientLaunch(FMLLaunchHandler.java:34)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraftforge.fml.common.launcher.FMLTweaker.injectIntoClassLoader(FMLTweaker.java:126)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraft.launchwrapper.Launch.launch(Launch.java:115)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTraceAsCause:488]: Caused by: java.lang.ClassNotFoundException: cpw.mods.fml.relauncher.IFMLLoadingPlugin
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTraceAsCause:490]: at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTraceAsCause:490]: at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTraceAsCause:490]: at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTraceAsCause:492]: ... 23 more
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTraceAsCause:488]: Caused by: java.lang.NullPointerException
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTraceAsCause:490]: at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTraceAsCause:492]: ... 25 more
[13:38:57] [main/ERROR] [FML]: An error occurred trying to configure the minecraft home at /Users/Edwards/Library/Application Support/minecraft for Forge Mod Loader
java.lang.NoClassDefFoundError: cpw/mods/fml/relauncher/IFMLLoadingPlugin
at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.6.0_65]
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:637) ~[?:1.6.0_65]
at java.lang.ClassLoader.defineClass(ClassLoader.java:621) ~[?:1.6.0_65]
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141) ~[?:1.6.0_65]
at java.net.URLClassLoader.defineClass(URLClassLoader.java:283) ~[?:1.6.0_65]
at java.net.URLClassLoader.access$000(URLClassLoader.java:58) ~[?:1.6.0_65]
at java.net.URLClassLoader$1.run(URLClassLoader.java:197) ~[?:1.6.0_65]
at java.security.AccessController.doPrivileged(Native Method) ~[?:1.6.0_65]
at java.net.URLClassLoader.findClass(URLClassLoader.java:190) ~[?:1.6.0_65]
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:117) ~[launchwrapper-1.11.jar:?]
at java.lang.ClassLoader.loadClass(ClassLoader.java:306) ~[?:1.6.0_65]
at java.lang.ClassLoader.loadClass(ClassLoader.java:247) ~[?:1.6.0_65]
at java.lang.Class.forName0(Native Method) ~[?:1.6.0_65]
at java.lang.Class.forName(Class.java:249) ~[?:1.6.0_65]
at net.minecraftforge.fml.relauncher.CoreModManager.loadCoreMod(CoreModManager.java:447) ~[forge-1.8-11.14.3.1450.jar:?]
at net.minecraftforge.fml.relauncher.CoreModManager.discoverCoreMods(CoreModManager.java:371) ~[forge-1.8-11.14.3.1450.jar:?]
at net.minecraftforge.fml.relauncher.CoreModManager.handleLaunch(CoreModManager.java:239) ~[forge-1.8-11.14.3.1450.jar:?]
at net.minecraftforge.fml.relauncher.FMLLaunchHandler.setupHome(FMLLaunchHandler.java:90) [forge-1.8-11.14.3.1450.jar:?]
at net.minecraftforge.fml.relauncher.FMLLaunchHandler.setupClient(FMLLaunchHandler.java:67) [forge-1.8-11.14.3.1450.jar:?]
at net.minecraftforge.fml.relauncher.FMLLaunchHandler.configureForClientLaunch(FMLLaunchHandler.java:34) [forge-1.8-11.14.3.1450.jar:?]
at net.minecraftforge.fml.common.launcher.FMLTweaker.injectIntoClassLoader(FMLTweaker.java:126) [forge-1.8-11.14.3.1450.jar:?]
at net.minecraft.launchwrapper.Launch.launch(Launch.java:115) [launchwrapper-1.11.jar:?]
at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.11.jar:?]
Caused by: java.lang.ClassNotFoundException: cpw.mods.fml.relauncher.IFMLLoadingPlugin
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191) ~[launchwrapper-1.11.jar:?]
at java.lang.ClassLoader.loadClass(ClassLoader.java:306) ~[?:1.6.0_65]
at java.lang.ClassLoader.loadClass(ClassLoader.java:247) ~[?:1.6.0_65]
... 23 more
Caused by: java.lang.NullPointerException
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182) ~[launchwrapper-1.11.jar:?]
at java.lang.ClassLoader.loadClass(ClassLoader.java:306) ~[?:1.6.0_65]
at java.lang.ClassLoader.loadClass(ClassLoader.java:247) ~[?:1.6.0_65]
... 23 more
Exception in thread "main" [13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:461]: java.lang.NoClassDefFoundError: cpw/mods/fml/relauncher/IFMLLoadingPlugin
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at java.lang.ClassLoader.defineClass1(Native Method)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at java.lang.ClassLoader.defineClassCond(ClassLoader.java:637)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at java.security.AccessController.doPrivileged(Native Method)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:117)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at java.lang.Class.forName0(Native Method)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at java.lang.Class.forName(Class.java:249)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraftforge.fml.relauncher.CoreModManager.loadCoreMod(CoreModManager.java:447)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraftforge.fml.relauncher.CoreModManager.discoverCoreMods(CoreModManager.java:371)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraftforge.fml.relauncher.CoreModManager.handleLaunch(CoreModManager.java:239)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraftforge.fml.relauncher.FMLLaunchHandler.setupHome(FMLLaunchHandler.java:90)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraftforge.fml.relauncher.FMLLaunchHandler.setupClient(FMLLaunchHandler.java:67)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraftforge.fml.relauncher.FMLLaunchHandler.configureForClientLaunch(FMLLaunchHandler.java:34)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraftforge.fml.common.launcher.FMLTweaker.injectIntoClassLoader(FMLTweaker.java:126)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraft.launchwrapper.Launch.launch(Launch.java:115)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:464]: at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTraceAsCause:488]: Caused by: java.lang.ClassNotFoundException: cpw.mods.fml.relauncher.IFMLLoadingPlugin
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTraceAsCause:490]: at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTraceAsCause:490]: at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTraceAsCause:490]: at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTraceAsCause:492]: ... 23 more
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTraceAsCause:488]: Caused by: java.lang.NullPointerException
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTraceAsCause:490]: at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182)
[13:38:57] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTraceAsCause:492]: ... 25 more
Anyone know what to do?
running this on OS X btw
Thanks in advance
Ok so i fixed it. I deleted some outdated mods (from 1.7.10) from the mods folder, seems to be working now. Hope this can help someone!
I got the same problem. Create a folder called 1.7.10, and put mods for that version in there. Then create a folder called 1.8, and put all the mods for that version in there. Don't put any mods directly in the mods folder. Then when you load each version, it will take the mods from that folder.
There are 10 types of people in the world. Those that understand binary and those that don't.
http://www.minecraftforum.net/forums/mapping-and-modding/resource-packs/2128869-1-9-15w35b-ragecraft-faithful-64x64
http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/1293018-opencomputers-v1-5-16
http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/1272467-flans-mod-5-0-apocalypse-1-0-helicopters-mechas