help

what to do if this happens                                                                                                                                             

*** MagicMinecraftLauncher 1.1.4 ***

  LCP: ;C:\Users\angel\Desktop\mods\forge\.minecraft\minecraft.jar;bin/jinput.jar;bin/lwjgl.jar;bin/lwjgl_util.jar

  MainClass: net.minecraft.client.Minecraft

java.lang.NoClassDefFoundError: org/lwjgl/LWJGLException

    at java.lang.Class.getDeclaredMethods0(Native Method)

    at java.lang.Class.privateGetDeclaredMethods(Unknown Source)

    at java.lang.Class.getMethod0(Unknown Source)

    at java.lang.Class.getMethod(Unknown Source)

    at magic.launcher.Launcher.main(Unknown Source)

Caused by: java.lang.ClassNotFoundException: org.lwjgl.LWJGLException

    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)

    ... 5 more