I downloaded 1.12.2 universal jar and cannot open it, when I try to start the server it shows this.
04.02 23:20:23 [Multicraft] Received start command
04.02 23:20:23 [Multicraft] Loading server properties
04.02 23:20:23 [Multicraft] Starting server!
04.02 23:20:23 [Multicraft] Loaded config for "Custom.jar (Upload and use your own JAR)"
04.02 23:20:23 [Multicraft] Updating eula.txt file
04.02 23:20:24 [Server] INFO We appear to be missing one or more essential library files.
04.02 23:20:24 [Server] INFO You will need to add them to your server before FML and Forge will run successfully.java.lang.ClassNotFoundException: net.minecraft.launchwrapper.Launch
04.02 23:20:24 [Server] INFO at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
04.02 23:20:24 [Server] INFO at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
04.02 23:20:24 [Server] INFO at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352)
04.02 23:20:24 [Server] INFO at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
04.02 23:20:24 [Server] INFO at java.lang.Class.forName0(Native Method)
04.02 23:20:24 [Server] INFO at java.lang.Class.forName(Class.java:348)
04.02 23:20:24 [Server] INFO at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.run(ServerLaunchWrapper.java:52)
04.02 23:20:24 [Server] INFO at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.main(ServerLaunchWrapper.java:34)
04.02 23:20:24 [Multicraft] Server shut down (starting)
04.02 23:20:24 [Multicraft] Not restarting crashed server.
04.02 23:20:24 [Multicraft] Stopping server!
04.02 23:20:26 [Multicraft] Looks like a crash, check the server console. Return value: 1
04.02 23:20:26 [Multicraft] Server stopped
