Tried to start a new server running Minecraft 1.7.10 and Buildcraft 7 (Yes, I know it is a Beta and subject to change).

I have googled the message and found no results including a google search with site:mod-buildcraft.com specified. Therefore, I am turning to you, the bug report forum

When trying to load I get the following crash message:

---- Minecraft Crash Report ----
// Would you like a cupcake?

Time: 5/9/15 5:50 PM
Description: Exception in server tick loop

cpw.mods.fml.common.LoaderException: java.lang.NoClassDefFoundError: buildcraft/core/CreativeTabBuildCraft
at cpw.mods.fml.common.LoadController.transition(LoadController.java:163)
at cpw.mods.fml.common.Loader.initializeMods(Loader.java:719)
at cpw.mods.fml.server.FMLServerHandler.finishServerLoading(FMLServerHandler.java:97)
at cpw.mods.fml.common.FMLCommonHandler.onServerStarted(FMLCommonHandler.java:319)
at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:210)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:387)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)
Caused by: java.lang.NoClassDefFoundError: buildcraft/core/CreativeTabBuildCraft
at forestry.pipes.proxy.ProxyPipes.initPropolisPipe(ProxyPipes.java:35)
at forestry.plugins.PluginPropolisPipe.postInit(PluginPropolisPipe.java:64)
at forestry.plugins.PluginManager.runPostInit(PluginManager.java:296)
at forestry.core.ForestryCore.postInit(ForestryCore.java:118)
at forestry.Forestry.postInit(Forestry.java:117)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at cpw.mods.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:532)
at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74)
at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)
at com.google.common.eventbus.EventBus.post(EventBus.java:275)
at cpw.mods.fml.common.LoadController.sendEventToModContainer(LoadController.java:212)
at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:190)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74)
at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)
at com.google.common.eventbus.EventBus.post(EventBus.java:275)
at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:119)
at cpw.mods.fml.common.Loader.initializeMods(Loader.java:717)
... 5 more
Caused by: java.lang.ClassNotFoundException: buildcraft.core.CreativeTabBuildCraft
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 36 more
Caused by: java.lang.NullPointerException

A detailed walkthrough of the error, its code path and all known details is as follows:

-- System Details --
Details:
Minecraft Version: 1.7.10
Operating System: Linux (amd64) version 2.6.32-504.16.2.el6.x86_64
Java Version: 1.8.0_45, Oracle Corporation
Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 1590757552 bytes (1517 MB) / 2008547328 bytes (1915 MB) up to 2008547328 bytes (1915 MB)
JVM Flags: 2 total; -Xmx2048M -Xms2048M
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v9.05 FML v7.10.141.1403 Minecraft Forge 10.13.3.1403 60 mods loaded, 60 mods active
mcp{9.05} Minecraft Coder Pack Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
FML{7.10.141.1403} Forge Mod Loader Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
Forge{10.13.3.1403} Minecraft Forge Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
CodeChickenCore{1.0.6.43} CodeChicken Core Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
NotEnoughItems{1.0.4.106} Not Enough Items Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
OpenModsCore{0.7.2} OpenModsCore Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
{000} CoFH ASM Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
bdlib{1.7.1.71} BD Lib Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
CoFHCore{1.7.10R3.0.2} CoFH Core Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
BigReactors{0.4.3A} Big Reactors Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
BiomesOPlenty{2.1.0} Biomes O' Plenty Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
IC2{2.2.718-experimental} IndustrialCraft 2 Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
BuildCraft|Core{7.0.3} BuildCraft Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
Forestry{3.5.4.13} Forestry for Minecraft Unloaded->Constructed->Pre-initialized->Initialized->Errored
BinnieCore{2.0-pre8} Binnie Core Unloaded->Constructed->Pre-initialized->Initialized->Errored
Botany{2.0-pre8} Botany Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
ExtraBees{2.0-pre8} Extra Bees Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
ExtraTrees{2.0-pre8} Extra Trees Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
Genetics{2.0-pre8} Genetics Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
BuildCraft|Energy{7.0.3} BuildCraft Energy Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
BuildCraft|Factory{7.0.3} BuildCraft Factory Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
BuildCraft|Robotics{7.0.3} BuildCraft Robotics Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
BuildCraft|Silicon{7.0.3} BuildCraft Silicon Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
BuildCraft|Transport{7.0.3} Buildcraft Transport Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
EnderIO{1.7.10-2.2.8.367} Ender IO Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
EnderTech{1.7.10-0.3.2.382} EnderTech Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
Mantle{1.7.10-0.3.2.jenkins184} Mantle Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
Waila{1.5.10} Waila Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
TConstruct{1.7.10-1.8.4.build939} Tinkers' Construct Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
ExtraTiC{1.4.1} ExtraTiC Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
ForgeMultipart{1.1.2.331} Forge Multipart Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
ExtraUtilities{1.2.4b} Extra Utilities Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
gendustry{1.4.10.77} GenDustry Unloaded->Constructed->Pre-initialized->Initialized->Errored
IronChest{6.0.62.742} Iron Chest Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
Mystcraft{0.11.5.00} Mystcraft Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
OpenMods{0.7.2} OpenMods Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
OpenBlocks{1.4.2} OpenBlocks Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
OpenPeripheralCore{1.1} OpenPeripheralCore Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
OpenPeripheral{0.3.1} OpenPeripheralAddons Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
Railcraft{9.6.1.0} Railcraft Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
OpenPeripheralIntegration{0.2.1} OpenPeripheralIntegration Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
MrTJPCoreMod{1.0.5.12} MrTJPCore Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
ProjRed|Core{4.5.16.77} ProjectRed Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
ProjRed|Transmission{4.5.16.77} ProjectRed-Transmission Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
ProjRed|Transportation{4.5.16.77} ProjectRed-Transportation Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
ProjRed|Exploration{4.5.16.77} ProjectRed-Exploration Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
ProjRed|Compatibility{4.5.16.77} ProjectRed-Compatibility Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
ProjRed|Integration{4.5.16.77} ProjectRed-Integration Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
ProjRed|Illumination{4.5.16.77} ProjectRed-Illumination Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
ProjRed|Expansion{4.5.16.77} ProjectRed-Expansion Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
rftools{2.80} RFTools Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
SolarExpansion{1.5a} Solar Expansion Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
TiCTooltips{1.2.4} TiC Tooltips Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
TwilightForest{2.3.5} The Twilight Forest Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
VersionChecker{1.1.8} Version Checker Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
WailaHarvestability{1.1.2} Waila Harvestability Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
wawla{1.2.1} What Are We Looking At Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
McMultipart{1.1.2.331} Minecraft Multipart Plugin Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
IguanaTweaksTConstruct{1.7.10-2.1.4.132} Iguana Tinker Tweaks Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
ForgeMicroblock{1.1.2.331} Forge Microblocks Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
OpenModsLib class transformers: [stencil_patches:ENABLED],[movement_callback:ENABLED],[map_gen_fix:FINISHED],[gl_capabilities_hook:ENABLED],[player_render_hook:ENABLED]
CoFHCore: -[1.7.10]3.0.2-262
Mantle Environment: Environment healthy.
TConstruct Environment: Environment healthy.
List of loaded APIs:
* BiomesOPlentyAPI (1.0.0) from BiomesOPlenty-1.7.10-2.1.0.1237-universal.jar
* BuildCraftAPI|blocks (1.0) from buildcraft-7.0.3-core.jar
* BuildCraftAPI|blueprints (1.2) from buildcraft-7.0.3-core.jar
* BuildCraftAPI|boards (1.0) from buildcraft-7.0.3-core.jar
* BuildCraftAPI|core (1.5) from buildcraft-7.0.3-core.jar
* BuildCraftAPI|events (1.0) from buildcraft-7.0.3-core.jar
* BuildCraftAPI|facades (1.1) from buildcraft-7.0.3-core.jar
* BuildCraftAPI|filler (4.0) from buildcraft-7.0.3-core.jar
* BuildCraftAPI|fuels (2.0) from buildcraft-7.0.3-core.jar
* BuildCraftAPI|gates (4.1) from buildcraft-7.0.3-core.jar
* BuildCraftAPI|items (1.1) from buildcraft-7.0.3-core.jar
* BuildCraftAPI|library (1.0) from buildcraft-7.0.3-core.jar
* BuildCraftAPI|power (1.3) from buildcraft-7.0.3-core.jar
* BuildCraftAPI|recipes (2.1) from buildcraft-7.0.3-core.jar
* BuildCraftAPI|robotics (1.2) from buildcraft-7.0.3-core.jar
* BuildCraftAPI|statements (1.1) from buildcraft-7.0.3-core.jar
* BuildCraftAPI|tablet (1.0) from buildcraft-7.0.3-core.jar
* BuildCraftAPI|tiles (1.1) from Railcraft_1.7.10-9.6.1.0.jar
* BuildCraftAPI|tools (1.0) from extrautilities-1.2.4b.jar
* BuildCraftAPI|transport (4.0) from buildcraft-7.0.3-core.jar
* CoFHAPI (1.7.10R1.0.0) from extrautilities-1.2.4b.jar
* CoFHAPI|block (1.7.10R1.0.7) from EnderTech-1.7.10-0.3.2.382.jar
* CoFHAPI|core (1.7.10R1.0.7) from EnderTech-1.7.10-0.3.2.382.jar
* CoFHAPI|energy (1.7.10R1.0.7) from EnderTech-1.7.10-0.3.2.382.jar
* CoFHAPI|fluid (1.7.10R1.0.12) from CoFHCore-[1.7.10]3.0.2-262.jar
* CoFHAPI|inventory (1.7.10R1.0.12) from CoFHCore-[1.7.10]3.0.2-262.jar
* CoFHAPI|item (1.7.10R1.0.3) from EnderIO-1.7.10-2.2.8.367.jar
* CoFHAPI|items (1.7.10R1.0.3) from SolarExpansion-Basic-1.5a.jar
* CoFHAPI|modhelpers (1.7.10R1.0.3) from SolarExpansion-Basic-1.5a.jar
* CoFHAPI|tileentity (1.7.10R1.0.12) from CoFHCore-[1.7.10]3.0.2-262.jar
* CoFHAPI|transport (1.7.10R1.0.7) from EnderTech-1.7.10-0.3.2.382.jar
* CoFHAPI|world (1.7.10R1.0.12) from CoFHCore-[1.7.10]3.0.2-262.jar
* CoFHLib (1.7.10R1.0.1) from CoFHCore-[1.7.10]3.0.2-262.jar
* CoFHLib|audio (1.7.10R1.0.1) from CoFHCore-[1.7.10]3.0.2-262.jar
* CoFHLib|gui (1.7.10R1.0.1) from CoFHCore-[1.7.10]3.0.2-262.jar
* CoFHLib|gui|container (1.7.10R1.0.0B9) from EnderTech-1.7.10-0.3.2.382.jar
* CoFHLib|gui|element (1.7.10R1.0.0B9) from EnderTech-1.7.10-0.3.2.382.jar
* CoFHLib|gui|element|listbox (1.7.10R1.0.1) from CoFHCore-[1.7.10]3.0.2-262.jar
* CoFHLib|gui|slot (1.7.10R1.0.0B9) from EnderTech-1.7.10-0.3.2.382.jar
* CoFHLib|inventory (1.7.10R1.0.1) from CoFHCore-[1.7.10]3.0.2-262.jar
* CoFHLib|render (1.7.10R1.0.1) from CoFHCore-[1.7.10]3.0.2-262.jar
* CoFHLib|render|particle (1.7.10R1.0.0B9) from EnderTech-1.7.10-0.3.2.382.jar
* CoFHLib|util (1.7.10R1.0.1) from CoFHCore-[1.7.10]3.0.2-262.jar
* CoFHLib|util|helpers (1.7.10R1.0.0B9) from EnderTech-1.7.10-0.3.2.382.jar
* CoFHLib|util|position (1.7.10R1.0.0B9) from EnderTech-1.7.10-0.3.2.382.jar
* CoFHLib|world (1.7.10R1.0.1) from CoFHCore-[1.7.10]3.0.2-262.jar
* CoFHLib|world|feature (1.7.10R1.0.1) from CoFHCore-[1.7.10]3.0.2-262.jar
* EnderIOAPI (0.0.2) from EnderIO-1.7.10-2.2.8.367.jar
* EnderIOAPI|Redstone (0.0.2) from EnderIO-1.7.10-2.2.8.367.jar
* EnderIOAPI|Tools (0.0.2) from EnderIO-1.7.10-2.2.8.367.jar
* ForestryAPI|apiculture (2.6.0) from forestry_1.7.10-3.5.4.13.jar
* ForestryAPI|arboriculture (2.3.0) from forestry_1.7.10-3.5.4.13.jar
* ForestryAPI|circuits (1.1.0) from forestry_1.7.10-3.5.4.13.jar
* ForestryAPI|core (2.6.1) from forestry_1.7.10-3.5.4.13.jar
* ForestryAPI|farming (1.1.0) from forestry_1.7.10-3.5.4.13.jar
* ForestryAPI|food (1.1.0) from forestry_1.7.10-3.5.4.13.jar
* ForestryAPI|fuels (2.0.1) from forestry_1.7.10-3.5.4.13.jar
* ForestryAPI|genetics (2.7.0) from forestry_1.7.10-3.5.4.13.jar
* ForestryAPI|hives (4.0.0) from forestry_1.7.10-3.5.4.13.jar
* ForestryAPI|lepidopterology (1.1) from forestry_1.7.10-3.5.4.13.jar
* ForestryAPI|mail (3.0.0) from forestry_1.7.10-3.5.4.13.jar
* ForestryAPI|recipes (2.1.0) from forestry_1.7.10-3.5.4.13.jar
* ForestryAPI|storage (2.3.0) from forestry_1.7.10-3.5.4.13.jar
* ForestryAPI|world (1.1.0) from forestry_1.7.10-3.5.4.13.jar
* gendustryAPI (1.4.10) from gendustry-mc1710-1.4.10.77.jar
* IC2API (1.0) from industrialcraft-2-2.2.718-experimental.jar
* Mystcraft|API (0.1) from mystcraft-1.7.10-0.11.5.00.jar
* OpenPeripheralApi (3.2) from OpenPeripheralCore-1.7.10-1.1.jar
* RailcraftAPI|bore (1.0.0) from Railcraft_1.7.10-9.6.1.0.jar
* RailcraftAPI|carts (1.3.1) from Railcraft_1.7.10-9.6.1.0.jar
* RailcraftAPI|core (1.3.0) from Railcraft_1.7.10-9.6.1.0.jar
* RailcraftAPI|crafting (1.0.0) from Railcraft_1.7.10-9.6.1.0.jar
* RailcraftAPI|electricity (1.6.0) from Railcraft_1.7.10-9.6.1.0.jar
* RailcraftAPI|events (1.0.0) from Railcraft_1.7.10-9.6.1.0.jar
* RailcraftAPI|fuel (1.0.0) from Railcraft_1.7.10-9.6.1.0.jar
* RailcraftAPI|helpers (1.1.0) from Railcraft_1.7.10-9.6.1.0.jar
* RailcraftAPI|items (1.0.0) from Railcraft_1.7.10-9.6.1.0.jar
* RailcraftAPI|locomotive (1.0.1) from Railcraft_1.7.10-9.6.1.0.jar
* RailcraftAPI|signals (1.3.0) from Railcraft_1.7.10-9.6.1.0.jar
* RailcraftAPI|tracks (2.0.0) from Railcraft_1.7.10-9.6.1.0.jar
* Thaumcraft|API (4.2.2.0) from Railcraft_1.7.10-9.6.1.0.jar
* WailaAPI (1.2) from Waila-1.5.10_1.7.10.jar
Profiler Position: N/A (disabled)
Is Modded: Definitely; Server brand changed to 'fml,forge'
Type: Dedicated Server (map_server.txt)-bash-4.1$

Forestry{3.5.4.13} Forestry for Minecraft Unloaded->Constructed->Pre-initialized->Initialized->Errored
BinnieCore{2.0-pre8} Binnie Core Unloaded->Constructed->Pre-initialized->Initialized->Errored

Duplicate of #2703