[10:32:01] [main/ERROR] [LaunchWrapper]: Unable to launch
320 java.lang.ClassNotFoundException: org.spongepowered.asm.launch.MixinTweaker
321 at java.net.URLClassLoader.findClass(URLClassLoader.java:382) ~[?:1.8.0_282]
322 at java.lang.ClassLoader.loadClass(ClassLoader.java:418) ~[?:1.8.0_282]
323 at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352) ~[?:1.8.0_282]
324 at java.lang.ClassLoader.loadClass(ClassLoader.java:351) ~[?:1.8.0_282]
325 at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:106) ~[launchwrapper-1.12.jar:?]
326 at java.lang.ClassLoader.loadClass(ClassLoader.java:418) ~[?:1.8.0_282]
327 at java.lang.ClassLoader.loadClass(ClassLoader.java:351) ~[?:1.8.0_282]
328 at java.lang.Class.forName0(Native Method) ~[?:1.8.0_282]
329 at java.lang.Class.forName(Class.java:348) ~[?:1.8.0_282]
330 at net.minecraft.launchwrapper.Launch.launch(Launch.java:98) [launchwrapper-1.12.jar:?]
331 at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]
332 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_282]
333 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_282]
334 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_282]
335 at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_282]
336 at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.run(ServerLaunchWrapper.java:70) [forge.jar:?]
337 at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.main(ServerLaunchWrapper.java:34) [forge.jar:?]
Class not found can be caused by lots of things.
What mods have you got and whats your java version?