Minecraft Forums

I received this once I logged in:

*** MagicMinecraftLauncher 1.2.2 ***
LCP: ;C:\Users\OPTIMUS.acera-PC\AppData\Roaming\.minecraft\bin\minecraft.jar;bin/jinput.jar;bin/lwjgl.jar;bin/lwjgl_util.jar
MainClass: net.minecraft.client.Minecraft
java.lang.SecurityException: Invalid signature file 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 magic.launcher.v.getInputStream(SourceFile:37)
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 magic.launcher.Launcher.main(SourceFile:181)

I just reinstalled Forge and Modloader, both 1.5.2, and this happened. What did I do wrong ?