Game Launcher

The game is running. Please wait.
Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=256M; support was removed in 8.0
[21:36:25] [main/INFO]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[21:36:25] [main/ERROR]: Unable to launch
java.lang.ClassNotFoundException: net.minecraftforge.fml.common.launcher.FMLTweaker
	at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.8.0_271]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_271]
	at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) ~[?:1.8.0_271]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_271]
	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:106) ~[launchwrapper-1.12.jar:?]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_271]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_271]
	at java.lang.Class.forName0(Native Method) ~[?:1.8.0_271]
	at java.lang.Class.forName(Unknown Source) ~[?:1.8.0_271]
	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:?]
Process ended with code: 1