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Hello

So i have installed 1.7.10 mincraft and ran the installer for forge 1.7.10. hand no problems but when i try and launch mincraft with forge i get this error



[spoiler]

[12:26:21] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[12:26:21] [main/INFO] [LaunchWrapper]: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[12:26:21] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker
[12:26:21] [main/INFO] [FML]: Forge Mod Loader version 7.10.18.1180 for Minecraft 1.7.10 loading
[12:26:21] [main/INFO] [FML]: Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_20, running on Windows 7:amd64:6.1, installed at C:\Program Files\Java\jre1.8.0_20
[12:26:21] [main/WARN] [FML]: The coremod mods.battlegear2.coremod.BattlegearLoadingPlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
java.lang.AbstractMethodError
 at cpw.mods.fml.relauncher.CoreModManager.loadCoreMod(CoreModManager.java:423)
 at cpw.mods.fml.relauncher.CoreModManager.discoverCoreMods(CoreModManager.java:310)
 at cpw.mods.fml.relauncher.CoreModManager.handleLaunch(CoreModManager.java:211)
 at cpw.mods.fml.relauncher.FMLLaunchHandler.setupHome(FMLLaunchHandler.java:90)
 at cpw.mods.fml.relauncher.FMLLaunchHandler.setupClient(FMLLaunchHandler.java:67)
 at cpw.mods.fml.relauncher.FMLLaunchHandler.configureForClientLaunch(FMLLaunchHandler.java:34)
 at cpw.mods.fml.common.launcher.FMLTweaker.injectIntoClassLoader(FMLTweaker.java:126)
 at net.minecraft.launchwrapper.Launch.launch(Launch.java:114)
 at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
[12:26:21] [main/ERROR] [FML]: An error occurred trying to configure the minecraft home at C:\Users\reaper\AppData\Roaming\.minecraft for Forge Mod Loader
java.lang.AbstractMethodError
 at cpw.mods.fml.relauncher.CoreModManager.loadCoreMod(CoreModManager.java:423) ~[forge-1.7.10-10.13.0.1180.jar:?]
 at cpw.mods.fml.relauncher.CoreModManager.discoverCoreMods(CoreModManager.java:310) ~[forge-1.7.10-10.13.0.1180.jar:?]
 at cpw.mods.fml.relauncher.CoreModManager.handleLaunch(CoreModManager.java:211) ~[forge-1.7.10-10.13.0.1180.jar:?]
 at cpw.mods.fml.relauncher.FMLLaunchHandler.setupHome(FMLLaunchHandler.java:90) [forge-1.7.10-10.13.0.1180.jar:?]
 at cpw.mods.fml.relauncher.FMLLaunchHandler.setupClient(FMLLaunchHandler.java:67) [forge-1.7.10-10.13.0.1180.jar:?]
 at cpw.mods.fml.relauncher.FMLLaunchHandler.configureForClientLaunch(FMLLaunchHandler.java:34) [forge-1.7.10-10.13.0.1180.jar:?]
 at cpw.mods.fml.common.launcher.FMLTweaker.injectIntoClassLoader(FMLTweaker.java:126) [forge-1.7.10-10.13.0.1180.jar:?]
 at net.minecraft.launchwrapper.Launch.launch(Launch.java:114) [launchwrapper-1.9.jar:?]
 at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.9.jar:?]
Exception in thread "main" java.lang.AbstractMethodError
 at cpw.mods.fml.relauncher.CoreModManager.loadCoreMod(CoreModManager.java:423)
 at cpw.mods.fml.relauncher.CoreModManager.discoverCoreMods(CoreModManager.java:310)
 at cpw.mods.fml.relauncher.CoreModManager.handleLaunch(CoreModManager.java:211)
 at cpw.mods.fml.relauncher.FMLLaunchHandler.setupHome(FMLLaunchHandler.java:90)
 at cpw.mods.fml.relauncher.FMLLaunchHandler.setupClient(FMLLaunchHandler.java:67)
 at cpw.mods.fml.relauncher.FMLLaunchHandler.configureForClientLaunch(FMLLaunchHandler.java:34)
 at cpw.mods.fml.common.launcher.FMLTweaker.injectIntoClassLoader(FMLTweaker.java:126)
 at net.minecraft.launchwrapper.Launch.launch(Launch.java:114)
 at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

 

[/spoiler]

now i have also encounter this same code with eclipse while trying to learn mod development.

[spoiler] 

[12:34:45] [main/INFO] [GradleStart]: No arguments specified, assuming client.

[12:34:45] [main/INFO] [GradleStart]: Extra: []
[12:34:45] [main/INFO] [GradleStart]: Running with arguments: [--userProperties, {}, --assetsDir, C:/Users/reaper/.gradle/caches/minecraft/assets, --assetIndex, 1.7.10, --accessToken, {REDACTED}, --version, 1.7.10, --tweakClass, cpw.mods.fml.common.launcher.FMLTweaker]
[12:34:45] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[12:34:45] [main/INFO] [LaunchWrapper]: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[12:34:45] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker
[12:34:45] [main/INFO] [FML]: Forge Mod Loader version 7.10.18.1180 for Minecraft 1.7.10 loading
[12:34:45] [main/INFO] [FML]: Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_20, running on Windows 7:amd64:6.1, installed at C:\Program Files\Java\jre1.8.0_20
[12:34:45] [main/INFO] [FML]: Managed to load a deobfuscated Minecraft name- we are in a deobfuscated environment. Skipping runtime deobfuscation
[12:34:45] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[12:34:45] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker
[12:34:45] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[12:34:45] [main/ERROR] [LaunchWrapper]: Unable to launch
java.util.ConcurrentModificationException
 at java.util.ArrayList$Itr.checkForComodification(Unknown Source) ~[?:1.8.0_20]
 at java.util.ArrayList$Itr.remove(Unknown Source) ~[?:1.8.0_20]
 at net.minecraft.launchwrapper.Launch.launch(Launch.java:117) [launchwrapper-1.9.jar:?]
 at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.9.jar:?]
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_20]
 at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_20]
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_20]
 at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_20]
 at GradleStart.bounce(GradleStart.java:107) [start/:?]
 at GradleStart.startClient(GradleStart.java:100) [start/:?]
 at GradleStart.main(GradleStart.java:55) [start/:?]
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0
 at GradleStart.main(GradleStart.java:59)
Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

 

[/spoiler]

this is the code that i have in eclips

[spoiler]

package net.Sephercraft.mod;

import cpw.mods.fml.common.Mod;

@Mod(modid = Sephercraft.modid, version = Sephercraft.version)

public class Sephercraft {

public static final String modid = "Sephercraft";
 public static final String version = "Alpha v0.1";
 
}

 

[/spoiler]



any help with this would be awesome thank you for your time