well, i need help with a problem. when i try to run my minecraft server, it crash instanly i say this:minecraft_server.1.12.2.jarminecraft_server.1.12.2.jar

 

openjdk version "1.8.0_262"

OpenJDK Runtime Environment (build 1.8.0_262-b10)

OpenJDK 64-Bit Server VM (build 25.262-b10, mixed mode)

:/home/container$ java -Xms128M -Xmx3070M -jar forge.jar

Exception in thread "main" java.lang.NoClassDefFoundError: joptsimple/OptionSpec

at java.lang.Class.forName0(Native Method)

at java.lang.Class.forName(Class.java:348)

at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.run(ServerLaunchWrapper.java:52)

at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.main(ServerLaunchWrapper.java:34)

Caused by: java.lang.ClassNotFoundException: joptsimple.OptionSpec

at java.net.URLClassLoader.findClass(URLClassLoader.java:382)

at java.lang.ClassLoader.loadClass(ClassLoader.java:418)

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352)

at java.lang.ClassLoader.loadClass(ClassLoader.java:351)

... 4 more

 

 

please tell what i have to do

1.12 is no longer supported on this forum.

Please update to 1.15 or 1.16 to receive support.