MtheGamer

i dont know what happened it just starts then back to the launcher everytime this is what it says when it returned to launcher: GameStarter running! net.minecraft.launchwrapper.Launch [10:16:06] [main/INFO]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker [10:16:06] [main/ERROR]: Unable to launch java.lang.ClassNotFoundException: net.minecraftforge.fml.common.launcher.FMLTweaker at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.8.0_211] at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_211] at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) ~[?:1.8.0_211] at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_211] at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:106) ~[launchwrapper-1.12.jar:?] at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_211] at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_211] at java.lang.Class.forName0(Native Method) ~[?:1.8.0_211] at java.lang.Class.forName(Unknown Source) ~[?:1.8.0_211] 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:?] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_211] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_211] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_211] at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_211] at info.mineshafter.GameStarter.main(GameStarter.java:33) [ms-starter.jar:?] Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release Edit : i tried opening minecraft 1.12.2 it crashed Minecraft: Minecraft 1.2.2 OS: Windows 7 (amd64) version 6.1 Java: 1.8.0_211, Oracle Corporation VM: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation LWJGL: 2.9.0 OpenGL: Intel(R) HD Graphics version 2.1.0 - Build 8.15.10.2993, Intel java.lang.NullPointerException at java.io.Reader.<init>(Unknown Source) at java.io.InputStreamReader.<init>(Unknown Source) at adi.a(SourceFile:62) at adi.a(SourceFile:99) at net.minecraft.client.Minecraft.a(SourceFile:256) at net.minecraft.client.Minecraft.run(SourceFile:650) at java.lang.Thread.run(Unknown Source) --- END ERROR REPORT 3621864e ----------