Help SMP server

1st Official Post

    I maked my own server whit IC2, but its a litl boring only whit IC2.Then i instaled Buildcrfaft 2.2.1 for server. In the beginning the server was working good. In about like 1h-2h the server crashed and now it crashes all the time. Help plese. What could i don wrong. Witch file i could miss? Plese help ;(

    at ModLoader.ThrowException(ModLoader.java:1206)
    at ModLoader.init(ModLoader.java:627)
    at ModLoader.Init(ModLoader.java:1269)
    at net.minecraft.server.MinecraftServer.c(MinecraftServer.java:74)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:262)
    at ce.run(SourceFile:417)
    Caused by: java.lang.NoClassDefFoundError: buildcraft/core/BluePrint
    at BuildCraftBuilders.<clinit>(BuildCraftBuilders.java:153)
    at mod_BuildCraftBuilders.ModsLoaded(mod_BuildCraftBuilders.java:22)
    at ModLoader.init(ModLoader.java:615)
    ... 4 more
    Caused by: java.lang.ClassNotFoundException: buildcraft.core.BluePrint
    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)
    ... 7 more