Giorgio35

hello, I'm trying to create a skyblock4 1.12.2 server, but when I open the server it tells me this: Starting Sky Factory 4 Server... A problem occurred running the Server launcher.java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.run(ServerLaunchWrapper.java:70) at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.main(ServerLaunchWrapper.java:34) Caused by: java.lang.NoClassDefFoundError: org/apache/logging/log4j/Level at net.minecraft.launchwrapper.Launch.launch(Launch.java:94) at net.minecraft.launchwrapper.Launch.main(Launch.java:28) ... 6 more Caused by: java.lang.ClassNotFoundException: org.apache.logging.log4j.Level at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) ... 8 more someone can help me please?