Crash using Buildcraft 3.5.3

PM Description: Unexpected error

java.lang.NoClassDefFoundError: buildcraft/core/utils/StringUtil at mistaqur.nei.buildcraft.BuildcraftFuelHelper.registerFuelHelpers(BuildcraftFuelHelper.java:23) at mistaqur.nei.NEIPlugins_Buildcraft.addHandlers(NEIPlugins_Buildcraft.java:89) at mistaqur.nei.NEIPlugins_Buildcraft.init(NEIPlugins_Buildcraft.java:62) at mistaqur.nei.NEIPlugins.initPlugins(NEIPlugins.java:194) at mistaqur.nei.NEIPlugins.loadConfig(NEIPlugins.java:180) at mistaqur.nei.common.NEIPluginsConfig.loadConfig(NEIPluginsConfig.java:12) at codechicken.nei.NEIClientConfig.loadConfig(NEIClientConfig.java:705) at codechicken.nei.NEIClientConfig.loadWorld(NEIClientConfig.java:301) at codechicken.nei.NEICPH.handleSMPCheck(NEICPH.java:119) at codechicken.nei.NEICPH.handlePacket(NEICPH.java:27) at codechicken.core.packet.PacketCustom$ClientPacketHandler.handle(PacketCustom.java:104) at codechicken.core.packet.PacketCustom$CustomPacketHandler.onPacketData(PacketCustom.java:73) at cpw.mods.fml.common.network.NetworkRegistry.handlePacket(NetworkRegistry.java:255) at cpw.mods.fml.common.network.NetworkRegistry.handleCustomPacket(NetworkRegistry.java:245) at cpw.mods.fml.common.network.FMLNetworkHandler.handlePacket250Packet(FMLNetworkHandler.java:83) at net.minecraft.client.multiplayer.NetClientHandler.func_72501_a(NetClientHandler.java:1571) at net.minecraft.network.packet.Packet250CustomPayload.func_73279_a(SourceFile:59) at net.minecraft.network.MemoryConnection.func_74428_b(MemoryConnection.java:89) at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1898) at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:834) at net.minecraft.client.Minecraft.run(Minecraft.java:759) at java.lang.Thread.run(Unknown Source) Caused by: java.lang.ClassNotFoundException: buildcraft.core.utils.StringUtil at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:238) at java.lang.ClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) ... 22 more Caused by: java.lang.NullPointerException

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