Remay_0

I made a modpack today and my client keeps crashing and idk why. Here's the log: [19:25:27] [main/ERROR] [LaunchWrapper/]: Unable to launch java.lang.reflect.InvocationTargetException: null at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_251] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_251] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_251] at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_251] at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) [launchwrapper-1.12.jar:?] at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?] Caused by: java.lang.NoClassDefFoundError: net/minecraft/client/gui/GuiScreenWorking at net.minecraft.client.main.Main.main(SourceFile:38) ~[Main.class:?] ... 6 more Caused by: java.lang.ClassNotFoundException: net.minecraft.client.gui.GuiScreenWorking at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191) ~[launchwrapper-1.12.jar:?] at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_251] at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_251] at net.minecraft.client.main.Main.main(SourceFile:38) ~[Main.class:?] ... 6 more Caused by: java.lang.NoClassDefFoundError: net/minecraft/util/IProgressUpdate at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.8.0_251] at java.lang.ClassLoader.defineClass(Unknown Source) ~[?:1.8.0_251] at java.security.SecureClassLoader.defineClass(Unknown Source) ~[?:1.8.0_251] at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182) ~[launchwrapper-1.12.jar:?] at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_251] at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_251] at net.minecraft.client.main.Main.main(SourceFile:38) ~[Main.class:?] ... 6 more Caused by: java.lang.ClassNotFoundException: net.minecraft.util.IProgressUpdate at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191) ~[launchwrapper-1.12.jar:?] at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_251] at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_251] at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.8.0_251] at java.lang.ClassLoader.defineClass(Unknown Source) ~[?:1.8.0_251] at java.security.SecureClassLoader.defineClass(Unknown Source) ~[?:1.8.0_251] at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182) ~[launchwrapper-1.12.jar:?] at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_251] at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_251] at net.minecraft.client.main.Main.main(SourceFile:38) ~[Main.class:?] ... 6 more Caused by: java.lang.ClassFormatError: Illegal field modifiers in class net/minecraft/util/IProgressUpdate: 0x1A at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.8.0_251] at java.lang.ClassLoader.defineClass(Unknown Source) ~[?:1.8.0_251] at java.security.SecureClassLoader.defineClass(Unknown Source) ~[?:1.8.0_251] at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182) ~[launchwrapper-1.12.jar:?] at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_251] at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_251] at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.8.0_251] at java.lang.ClassLoader.defineClass(Unknown Source) ~[?:1.8.0_251] at java.security.SecureClassLoader.defineClass(Unknown Source) ~[?:1.8.0_251] at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182) ~[launchwrapper-1.12.jar:?] at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_251] at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_251] at net.minecraft.client.main.Main.main(SourceFile:38) ~[Main.class:?] ... 6 more [19:25:27] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:-1]: net.minecraftforge.fml.relauncher.FMLSecurityManager$ExitTrappedException [19:25:27] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:-1]: at net.minecraftforge.fml.relauncher.FMLSecurityManager.checkPermission(FMLSecurityManager.java:49) [19:25:27] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:-1]: at java.lang.SecurityManager.checkExit(Unknown Source) [19:25:27] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:-1]: at java.lang.Runtime.exit(Unknown Source) [19:25:27] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:-1]: at java.lang.System.exit(Unknown Source) [19:25:27] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:-1]: at net.minecraft.launchwrapper.Launch.launch(Launch.java:138) [19:25:27] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:-1]: at net.minecraft.launchwrapper.Launch.main(Launch.java:28) Pls help