[1.7.2-1.7.10] launch error

[WARDOGSK93]

i dont know why but when i launch minecraft in debug mode or in non-debug mode in eclipse it gives me this error

 

[10:06:56] [main/INFO] [GradleStart]: username: "YOUR_USERNAME_HERE"
[10:06:56] [main/INFO] [GradleStart]: Extra: []
[10:06:56] [main/INFO] [GradleStart]: Password found, attempting login
[10:06:56] [main/INFO]: Logging in with username & password
[10:06:58] [main/INFO] [GradleStart]: Login Succesful!
[10:06:58] [main/INFO] [GradleStart]: Running with arguments: [--userProperties, {twitch_access_token=[com.mojang.authlib.properties.Property@6fb365ed]}, --assetsDir, C:/Users/wayne_000/.gradle/caches/minecraft/assets, --assetIndex, 1.7.10, --accessToken, {REDACTED}, --version, 1.7.10, --uuid, "SOME_UUID", --tweakClass, cpw.mods.fml.common.launcher.FMLTweaker, --username, "YOUR_USERNAME_HERE"]
[10:06:58] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[10:06:58] [main/INFO] [LaunchWrapper]: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[10:06:58] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker
[10:06:58] [main/INFO] [FML]: Forge Mod Loader version 7.10.25.1208 for Minecraft 1.7.10 loading
[10:06:58] [main/INFO] [FML]: Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_20, running on Windows 8:amd64:6.2, installed at C:\Program Files\Java\jre1.8.0_20
[10:06:58] [main/INFO] [FML]: Managed to load a deobfuscated Minecraft name- we are in a deobfuscated environment. Skipping runtime deobfuscation
[10:06:58] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[10:06:58] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker
[10:06:58] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[10:06:58] [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:65) [start/:?]

and i have removed details to my account from the error log above like my uuid and username for security reasons but i have renamed them to "YOUR_USERNAME_HERE" for the username and "SOME_UUID" for the uuid

 

the minecraft version i get this on is 1.7.2 but i updated to 1.7.10 see if it was already fixed but its not so im posting this

 

here are some screen shots and i have blurred the usernames and passwords:

 

https://www.dropbox.com/s/dees52e3c3maro4/Error2.png?dl=0

https://www.dropbox.com/s/ot5cf0rr4ttjqm2/Error1.png?dl=0

[shieldbug1]

Read the EAQ!

[WARDOGSK93]

can you tell me why im getting this error

[shieldbug1]

The EAQ tells you EXACTLY what is causing it, and how to fix it.