Bug with Eclipse, Minecraft not starting!

When I click on the green icon, it doesn't want to start Minecraft. Could anyone help?

Here's what I get :

[13:20:39] [main/INFO] [GradleStart]: Extra: []

[13:20:39] [main/INFO] [GradleStart]: Running with arguments: [--tweakClass, cpw.mods.fml.common.launcher.FMLServerTweaker, --tweakClass, net.minecraftforge.gradle.GradleStartCommon$GradleStartTweaker]

[13:20:39] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLServerTweaker

[13:20:40] [main/INFO] [LaunchWrapper]: Using primary tweak class name cpw.mods.fml.common.launcher.FMLServerTweaker

[13:20:40] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.gradle.GradleStartCommon$GradleStartTweaker

[13:20:40] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLServerTweaker

[13:20:40] [main/INFO] [FML]: Forge Mod Loader version 7.10.18.1180 for Minecraft 1.7.10 loading

[13:20:40] [main/INFO] [FML]: Java is Java HotSpot 64-Bit Server VM, version 1.8.0_25, running on Windows 8.1:amd64:6.3, installed at C:\Program Files\Java\jre1.8.0_25

[13:20:40] [main/INFO] [FML]: Managed to load a deobfuscated Minecraft name- we are in a deobfuscated environment. Skipping runtime deobfuscation

[13:20:40] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.gradle.GradleStartCommon$GradleStartTweaker

[13:20:40] [main/INFO] [GradleStart]: Injecting location in coremod cpw.mods.fml.relauncher.FMLCorePlugin

[13:20:40] [main/INFO] [GradleStart]: Injecting location in coremod net.minecraftforge.classloading.FMLForgePlugin

[13:20:40] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker

[13:20:40] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker

[13:20:40] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker

[13:20:40] [main/ERROR] [LaunchWrapper]: Unable to launch

java.util.ConcurrentModificationException

at java.util.ArrayList$Itr.checkForComodification(Unknown Source) ~[?:1.8.0_25]

at java.util.ArrayList$Itr.remove(Unknown Source) ~[?:1.8.0_25]

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 net.minecraftforge.gradle.GradleStartCommon.launch(GradleStartCommon.java:78) [start/:?]

at GradleStartServer.main(GradleStartServer.java:10) [start/:?]

Java HotSpot 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release