I am using the server files offered by Feed the Beast for their revelations modpack. Whenever I run start.bat I receive this message:

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:77)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:568)
        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

The server.jar will open and run, but the forge.jar will not. What can I do to fix this?

which version of Forge did you use and which java version?

I am using java 8. How do I check which forge version I am using?

33 minutes ago, WoolyMamit said:

How do I check which forge version I am using?

which one did you install?

2 hours ago, Luis_ST said:

which one did you install?

The one that I installed is forge-1.12.2-14.23.5.2846-universal.

 

 

 

 

Edited April 12, 20223 yr by WoolyMamit

5 hours ago, Luis_ST said:

which one did you install?

figured it out