Hi!

i just installed forge (i dragged the contents of the .zip in the MC.jar in bin), and i get this:

 

 

 

D:\Documents and Settings\Rendszergazda\Application Data\.minecraft>java -Xmx102
4M -Xms768M -cp Minecraftsp.jar net.minecraft.LauncherFrame
Hello!
URL: file:/D:/Documents%20and%20Settings/Rendszergazda/Application%20Data/.minec
raft/bin/lwjgl.jar
URL: file:/D:/Documents%20and%20Settings/Rendszergazda/Application%20Data/.minec
raft/bin/jinput.jar
URL: file:/D:/Documents%20and%20Settings/Rendszergazda/Application%20Data/.minec
raft/bin/lwjgl_util.jar
URL: file:/D:/Documents%20and%20Settings/Rendszergazda/Application%20Data/.minec
raft/bin/minecraft.jar
URL: file:/D:/Documents%20and%20Settings/Rendszergazda/Application%20Data/.minec
raft/bin/windows_natives.jar
Exception in thread "Thread-3" java.lang.SecurityException: Invalid signature fi
le digest for Manifest main attributes
        at sun.security.util.SignatureFileVerifier.processImpl(Unknown Source)
        at sun.security.util.SignatureFileVerifier.process(Unknown Source)
        at java.util.jar.JarVerifier.processEntry(Unknown Source)
        at java.util.jar.JarVerifier.update(Unknown Source)
        at java.util.jar.JarFile.initializeVerifier(Unknown Source)
        at java.util.jar.JarFile.getInputStream(Unknown Source)
        at sun.misc.URLClassPath$JarLoader$2.getInputStream(Unknown Source)
        at sun.misc.Resource.cachedInputStream(Unknown Source)
        at sun.misc.Resource.getByteBuffer(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 java.lang.ClassLoader.loadClass(Unknown Source)
        at net.minecraft.GameUpdater.createApplet(GameUpdater.java:284)
        at net.minecraft.Launcher$1.run(Launcher.java:94)

 

 

how to fix this?

Delete META-INF

Delete META-INF

 

It worked, forge has its own Meta-inf. i remembered, that i shouldn't delete meta-inf when installing forge!

you need to kill mojang's, not ours.