Minecraft 1.8 & 1.7.10 Forge Help

[GoldenKiller10]

When ever i try to run 1.8 or 1.7.10 Forge IT Doesn't WORK it crashes

if anyone can help plz help 

* When i run 1.8 IT Says
"[09:02:07] [main/INFO]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[09:02:07] [main/ERROR]: Unable to launch
java.lang.ClassNotFoundException: net.minecraftforge.fml.common.launcher.FMLTweaker
    at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.8.0_121]
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_121]
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) ~[?:1.8.0_121]
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_121]
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:106) ~[launchwrapper-1.12.jar:?]
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_121]
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_121]
    at java.lang.Class.forName0(Native Method) ~[?:1.8.0_121]
    at java.lang.Class.forName(Unknown Source) ~[?:1.8.0_121]
    at net.minecraft.launchwrapper.Launch.launch(Launch.java:98) [launchwrapper-1.12.jar:?]
    at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]
Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release"


When I Run 1.7.10 IT Says
"[09:09:25] [main/INFO]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[09:09:25] [main/ERROR]: Unable to launch
java.lang.ClassNotFoundException: cpw.mods.fml.common.launcher.FMLTweaker
    at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.8.0_121]
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_121]
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) ~[?:1.8.0_121]
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_121]
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:106) ~[launchwrapper-1.12.jar:?]
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_121]
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_121]
    at java.lang.Class.forName0(Native Method) ~[?:1.8.0_121]
    at java.lang.Class.forName(Unknown Source) ~[?:1.8.0_121]
    at net.minecraft.launchwrapper.Launch.launch(Launch.java:98) [launchwrapper-1.12.jar:?]
    at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]
Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release"

Please Help

[larsgerrits]

1) 1.7.10 is no longer supported on this forum, so you'll only get help with 1.8+.

2) How did you install Forge? Which Forge version did you use?

[GoldenKiller10]

3 minutes ago, larsgerrits said:

1) 1.7.10 is no longer supported on this forum, so you'll only get help with 1.8+.

2) How did you install Forge? Which Forge version did you use?

1.8.0

[GoldenKiller10]

3 minutes ago, diesieben07 said:

Which launcher are you using? And if you must use 1.8.x use 1.8.9.

oh ok