What could this mean?

Question

Java

We appear to be missing one or more essential library files.
You will need to add them to your server before FML and Forge will run successfully.java.lang.ClassNotFoundException: net.minecraft.launchwrapper.Launch
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang. ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0 (Native Method)
at java.lang.Class.forName(Class.java:348)
at cpw.mods.fml.relauncher.ServerLaunchWrapper.run(ServerLaunchWrapper.java:25)
at cpw.mods.fml.relauncher.ServerLaunchWrapper.main(ServerLaunchWrapper.java:12)

Answer 1

What you can't google
https://www.hosthorde.com/forums/resources/forge-i...
https://extravm.com/billing/knowledgebase/8/Fix-Fo...
minecraft.curseforge.com/ forums/jadeds-packs/agrar...

Answer 2

Writes that there are not enough library files. Add them.