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java.lang.NullPointerException: 	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182)	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)	at java.lang.Class.getDeclaredFields0(Native Method)	at java.lang.Class.privateGetDeclaredFields(Class.java:2583)	at java.lang.Class.getField0(Class.java:2975)	at java.lang.Class.getField(Class.java:1701)	at net.minecraftforge.fml.client.FMLClientHandler.detectOptifine(FMLClientHandler.java:283)	at net.minecraftforge.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:195)	at net.minecraft.client.Minecraft.startGame(Minecraft.java:475)	at net.minecraft.client.Minecraft.run(Minecraft.java:384)	at net.minecraft.client.main.Main.main(Main.java:118)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at net.minecraftforge.gradle.GradleStartCommon.launch(GradleStartCommon.java:97)	at undefined.GradleStart.main(GradleStart.java:26)