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Cannot install the Forge 6.4.x


OUGHT

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Hello! I have a problem with 6.4.x versions of Forge.

When I try to install it to the SMP (either extracting into minecraft_server.jar or running minecraftforge.jar) I recieve error:

 

Exception in thread "main" java.lang.IncompatibleClassChangeError: Implementing

class

        at java.lang.ClassLoader.defineClass1(Native Method)

        at java.lang.ClassLoader.defineClass(Unknown Source)

        at java.security.SecureClassLoader.defineClass(Unknown Source)

        at java.net.URLClassLoader.defineClass(Unknown Source)

        at java.net.URLClassLoader.access$100(Unknown Source)

        at java.net.URLClassLoader$1.run(Unknown Source)

        at java.net.URLClassLoader$1.run(Unknown Source)

        at java.security.AccessController.doPrivileged(Native Method)

        at java.net.URLClassLoader.findClass(Unknown Source)

        at java.lang.ClassLoader.loadClass(Unknown Source)

        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)

        at java.lang.ClassLoader.loadClass(Unknown Source)

        at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)

 

Tried multiple versions of Forge, looked through forum, did not found the solve. Please, help me.

The Mary Sue is not defined by her power, but by her lack of an even more powerful opponent. ©LessWrong

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What version of your server do you have?

 

Also did you delete the files with MOJANG in their filename inside the META-INF folder after installing Forge?

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This thread makes me sad because people just post copy-paste-ready code when it's obvious that the OP has little to no programming experience. This is not how learning works.

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