Error, 1.4.6

[Lakares]

I keep trying to load forge on my minecraft, and every time i log in it says "updating minecraft" with a bar thats almost full and the word "done" underneath, and wont go any further :L ive left it for hours, re installed, tried looking for a solution but couldnt find one, i downloaded the error reader and i got this:

 

 

Starting Minecraft...

 

Exception in thread "main" java.lang.SecurityException: Invalid signature file d

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

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

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

 

Finished session

 

 

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Press any key to continue . . .

 

please tell me if ive done something stupid im not that good at this error stuff...

[HMPerson1]

Did you delete META-INF?