Support Request: Need install help

1st Official Post

    Mods loaded: 1
    ModLoader Beta 1.7.3


    Minecraft has crashed!
    ----------------------


    Minecraft has stopped running because it encountered a problem.


    If you wish to report this, please copy this entire text and email it to support@mojang.com.
    Please include a description of what you did when the error occured.




    --- BEGIN ERROR REPORT e9df3db --------
    Generated 10/07/11 15:45


    Minecraft: Minecraft Beta 1.7.3
    OS: Windows XP (x86) version 5.1
    Java: 1.6.0_26, Sun Microsystems Inc.
    VM: Java HotSpot(TM) Client VM (mixed mode), Sun Microsystems Inc.
    LWJGL: 2.4.2
    OpenGL: GeForce 7900 GT/GTO/PCI/SSE2 version 2.1.2, NVIDIA Corporation


    java.lang.NoClassDefFoundError: ModSaver
    at fd.D(World.java:280)
    at fd.a(World.java:267)
    at fd.l(World.java:2049)
    at net.minecraft.client.Minecraft.k(SourceFile:1498)
    at net.minecraft.client.Minecraft.run(SourceFile:754)
    at java.lang.Thread.run(Unknown Source)
    Caused by: java.lang.ClassNotFoundException: ModSaver
    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)
    ... 6 more
    --- END ERROR REPORT 24325d5d ----------