구글 클라우드에서 설치하고 있는데 

java -Xms500M -Xmx4G -jar forge.jar  를 치고 나면 이렇게 뜹니다

A problem occurred running the Server launcher.java.lang.reflect.InvocationTargetException        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)        at java.base/java.lang.reflect.Method.invoke(Method.java:566)        at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.run(ServerLaunchWrapper.java:70)        at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.main(ServerLaunchWrapper.java:34)Caused by: java.lang.ClassCastException: class jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to class java.net.URLClassLoader (jdk.internal.loader.ClassLoaders$AppClassLoader and java.net.URLClassLoader are in module java.base of loader 'bootstrap')        at net.minecraft.launchwrapper.Launch.<init>(Launch.java:34)        at net.minecraft.launchwrapper.Launch.main(Launch.java:28)        ... 6 more

어떻게 해결해야 하나요