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So whenever I try to load my friends multiplayer server and i keep getting this message whenever I try to load the server up. I have no idea how to read heads or tails of these things, so any help I could get would be much appreciated.

---- Minecraft Crash Report ----
// Don't be sad. I'll do better next time, I promise!

Time: 3/22/15 1:59 PM
Description: Ticking screen

java.lang.NoClassDefFoundError: micdoodle8/mods/galacticraft/core/entities/player/GCEntityOtherPlayerMP
at net.minecraft.client.network.NetHandlerLoginClient.func_147232_a(NetHandlerLoginClient.java:121)
at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:201)
at net.minecraft.client.multiplayer.GuiConnecting.func_73876_c(SourceFile:78)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1649)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:961)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:887)
at net.minecraft.client.main.Main.main(SourceFile:148)
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:483)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
Caused by: java.lang.ClassNotFoundException: micdoodle8.mods.galacticraft.core.entities.player.GCEntityOtherPlayerMP
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)
... 13 more
Caused by: java.lang.NullPointerException
at org.objectweb.asm.ClassReader.<init>(Unknown Source)
at micdoodle8.mods.miccore.MicdoodleTransformer.startInjection(MicdoodleTransformer.java:1770)
at micdoodle8.mods.miccore.MicdoodleTransformer.transformCustomAnnotations(MicdoodleTransformer.java:911)
at micdoodle8.mods.miccore.MicdoodleTransformer.transform(MicdoodleTransformer.java:305)
at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:279)
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:176)
... 15 more

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

-- Head --
Stacktrace:
at net.minecraft.client.network.NetHandlerLoginClient.func_147232_a(NetHandlerLoginClient.java:121)
at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:201)
at net.minecraft.client.multiplayer.GuiConnecting.func_73876_c(SourceFile:78)

-- Affected screen --
Details:
Screen name: net.minecraft.client.multiplayer.GuiConnecting
Stacktrace:
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1649)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:961)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:887)
at net.minecraft.client.main.Main.main(SourceFile:148)
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:483)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

-- System Details --
Details:
Minecraft Version: 1.7.10
Operating System: Windows 8.1 (amd64) version 6.3
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 346386280 bytes (330 MB) / 1060372480 bytes (1011 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
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 v7.10.85.1291 Minecraft Forge 10.13.2.1291 91 mods loaded, 91 mods active
mcp{9.05} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
FML{7.10.85.1291} [Forge Mod Loader] (forge-1.7.10-10.13.2.1291.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Forge{10.13.2.1291} [Minecraft Forge] (forge-1.7.10-10.13.2.1291.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
CodeChickenCore{1.0.4.29} [CodeChicken Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
<CoFH ASM>{000} [CoFH ASM Data Initialization] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Micdoodlecore{} [Micdoodle8 Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
NotEnoughItems{1.0.3.74} [Not Enough Items] (Not-Enough-Items.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
battlegear2{1.0.7.0} [Mine & Blade Battlegear 2 - Bullseye] (1.7.10-MB_Battlegear2-Bullseye-1.0.7.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
bspkrsCore{6.15} [bspkrsCore] ([1.7.10]bspkrsCore-universal-6.15.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
StartingInventory{1.7.10.r01} [StartingInventory] ([1.7.10]StartingInventory-universal-1.7.10.r01.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
CoFHCore{1.7.10R3.0.0RC1} [CoFH Core] (CoFHCore-[1.7.10]3.0.0RC1-181.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
BuildCraft|Core{6.3.6} [BuildCraft] (buildcraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
BuildCraft|Transport{6.3.6} [BC Transport] (buildcraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
BuildCraft|Silicon{6.3.6} [BC Silicon] (buildcraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
BuildCraft|Factory{6.3.6} [BC Factory] (buildcraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
additionalpipes{3.4} [Additional Pipes] (additionalpipes-3.4.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
advancedgenetics{1.5.8} [Advanced Genetics] (advancedgenetics-1.7.10-1.5.8.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Forestry{3.4.0.7} [Forestry for Minecraft] (forestry.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
MineFactoryReloaded{1.7.10R2.8.0RC6} [MineFactory Reloaded] (MineFactoryReloaded.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
BuildCraft|Builders{6.3.6} [BC Builders] (buildcraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
BuildCraft|Energy{6.3.6} [BC Energy] (buildcraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Baubles{1.0.1.10} [Baubles] (Baubles-1.7.10-1.0.1.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Thaumcraft{4.2.3.5} [Thaumcraft] (Thaumcraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Railcraft{9.4.0.0} [Railcraft] (Railcraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Artifice{1.7.10R1.1.4} [Artifice] (Artifice-1.7.10-1.1.4-310.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
BetterAnvil{4.0.0.0} [Better Anvil] (Better-Anvils-Mod-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
betterstorage{0.9.2.107} [BetterStorage] (Better-Storage-Mod.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
bettervillages{0.4} [Better Villages Mod] (BetterVillages.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
BiblioCraft{1.9.2} [BiblioCraft] (BiblioCraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
AWWayofTime{v1.3.0Beta} [Blood Magic: Alchemical Wizardry] (BloodMagic.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
CarpentersBlocks{3.2.8} [Carpenter's Blocks] (Carpenter's Blocks.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
customnpcs{1.7.10b} [CustomNpcs] (CustomNPCs_1.7.10b.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
MoCreatures{6.3.1} [DrZhark's Mo'Creatures Mod] (DrZharks MoCreatures Mod v6.3.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
DungeonPack{1.5.2 v3} [DungeonPack] (DungeonPack 1.5.2 v3 Universal.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
eplus{3.0.2-d} [Enchanting Plus] (EnchantingPlus-1.7.10-3.0.2-d.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
ThermalFoundation{1.7.10R1.0.0RC2} [Thermal Foundation] (ThermalFoundation.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
ThermalExpansion{1.7.10R4.0.0RC1} [Thermal Expansion] (ThermalExpansion.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
EnderTech{1.7.10-0.3.0.364} [EnderTech] (EnderTech-1.7.10-0.3.0.364.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
FinndusFillies{2.1.0.12} [Finndus Fillies] (FinndusFillies.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
IronChest{6.0.62.742} [Iron Chest] (Iron-Chests-Mod-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
AnimationAPI{1.2.1} [AnimationAPI] (JurassiCraft-1.1.0_SNAPSHOT.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
AnimationExample{1.0.0} [Animation Example] (JurassiCraft-1.1.0_SNAPSHOT.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
jurassicraft{1.1.2} [JurassiCraft] (JurassiCraft-1.1.0_SNAPSHOT.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
LogisticsPipes{0.8.3.102} [Logistics Pipes] (logisticspipes-0.8.3.102.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
magicalcrops{1.7.2 - 0.1 ALPHA} [Magical Crops] (magicalcrops.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Mantle{1.7.10-0.3.2.jenkins184} [Mantle] (Mantle.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
radixcore{1.3.4} [RadixCore] (RadixCore-1.7.10-1.3.4-universal.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
mca{4.1.5} [Minecraft Comes Alive] (MCA-1.7.10-4.1.5-universal.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
ForgeMultipart{1.1.0.314} [Forge Multipart] (ForgeMultipart-1.7.10-1.1.0.314-universal.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Mekanism{7.1.1} [Mekanism] (Mekanism.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
MekanismGenerators{7.1.1} [MekanismGenerators] (MekanismGenerators.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
MekanismTools{7.1.1} [MekanismTools] (MekanismTools.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
MineFactoryReloaded|CompatAppliedEnergistics{1.7.10R2.8.0RC6} [MFR Compat: Applied Energistics] (MineFactoryReloaded.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
MineFactoryReloaded|CompatAtum{1.7.10R2.8.0RC6} [MFR Compat: Atum] (MineFactoryReloaded.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
MineFactoryReloaded|CompatBackTools{1.7.10R2.8.0RC6} [MFR Compat: BackTools] (MineFactoryReloaded.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
MineFactoryReloaded|CompatBuildCraft{1.7.10R2.8.0RC6} [MFR Compat: BuildCraft] (MineFactoryReloaded.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
MineFactoryReloaded|CompatChococraft{1.7.10R2.8.0RC6} [MFR Compat: Chococraft] (MineFactoryReloaded.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
MineFactoryReloaded|CompatExtraBiomes{1.7.10R2.8.0RC6} [MFR Compat: ExtraBiomes] (MineFactoryReloaded.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
MineFactoryReloaded|CompatForestry{1.7.10R2.8.0RC6} [MFR Compat: Forestry] (MineFactoryReloaded.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
MineFactoryReloaded|CompatForgeMicroblock{1.7.10R2.8.0RC6} [MFR Compat: ForgeMicroblock] (MineFactoryReloaded.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
MineFactoryReloaded|CompatIC2{1.7.10R2.8.0RC6} [MFR Compat: IC2] (MineFactoryReloaded.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
MineFactoryReloaded|CompatMystcraft{1.7.10R2.8.0RC6} [MFR Compat: Mystcraft] (MineFactoryReloaded.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
MineFactoryReloaded|CompatProjRed{1.7.10R2.8.0RC6} [MFR Compat ProjectRed] (MineFactoryReloaded.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
MineFactoryReloaded|CompatRailcraft{1.7.10R2.8.0RC6} [MFR Compat: Railcraft] (MineFactoryReloaded.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
MineFactoryReloaded|CompatRP2{1.7.10R2.8.0RC6} [MFR Compat: RP2] (MineFactoryReloaded.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
MineFactoryReloaded|CompatSufficientBiomes{1.7.10R2.8.0RC6} [MFR Compat: Sufficient Biomes] (MineFactoryReloaded.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
MineFactoryReloaded|CompatThaumcraft{1.7.10R2.8.0RC6} [MFR Compat: Thaumcraft] (MineFactoryReloaded.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
MineFactoryReloaded|CompatThermalExpansion{1.7.10R2.8.0RC6} [MFR Compat: Thermal Expansion] (MineFactoryReloaded.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Waila{1.5.7} [Waila] (Waila.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
TConstruct{1.7.10-1.8.2.build858} [Tinkers' Construct] (Tinkers Construct.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
MineFactoryReloaded|CompatTConstruct{1.7.10R2.8.0RC6} [MFR Compat: Tinkers' Construct] (MineFactoryReloaded.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
MineFactoryReloaded|CompatTwilightForest{1.7.10R2.8.0RC6} [MFR Compat: TwilightForest] (MineFactoryReloaded.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
MineFactoryReloaded|CompatVanilla{1.7.10R2.8.0RC6} [MFR Compat: Vanilla] (MineFactoryReloaded.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
cfm{3.4.7} [§9MrCrayfish's Furniture Mod] (MrCrayfishFurnitureModv3.4.7(1.7.10).jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
numina{0.4.0.100} [Numina] (Numina-0.4.0.100.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
desertcraft{1.7.2b} [Pam's DesertCraft] (Pam's DesertCraft.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
getalltheseeds{1.7.2a} [Pam's Get all the Seeds!] (Pam's Get all the Seeds 1.7.2a.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
harvestcraft{1.7.10d} [Pam's HarvestCraft] (Pam's HarvestCraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
ReiMinimap{1.7.10} [Rei's Minimap] (Reis-Minimap-Mod-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
AS_Ruins{14.7} [Ruins Spawning System] (Ruins.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
rwbyCraft{1.7.2} [RWBY Craft By KelcoK22] (rwby_c_1.7.10_V1.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
securitycraft{v1.6.1} [SecurityCraft] (SecurityCraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
tradeboothmod{1.7.10.2} [tradeboothmod] (tradebooth.1.7.10.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Treecapitator{1.7.10} [Treecapitator] (Treecapitator-universal-2.0.4.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
WailaHarvestability{1.1.0} [Waila Harvestability] (WailaHarvestability.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
weaponmod{v1.14.3} [Balkon's WeaponMod] (weaponmod-1.14.3.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
witchery{0.20.6} [Witchery] (witchery.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
YAFM{1.0.3} [Yet Another Food Mod] (yafm.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
YALSM{2.1.3} [Yet Another Leather Smelting Mod] (yalsm.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
McMultipart{1.1.0.314} [Minecraft Multipart Plugin] (ForgeMultipart-1.7.10-1.1.0.314-universal.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
ForgeMicroblock{1.1.0.314} [Forge Microblocks] (ForgeMultipart-1.7.10-1.1.0.314-universal.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
CoFHCore: -[1.7.10]3.0.0RC1-181
MineFactoryReloaded: Lacking version information.
ThermalFoundation: -[1.7.10]1.0.0RC2-53
ThermalExpansion: -[1.7.10]4.0.0RC1-119
Mantle Environment: Environment healthy.
TConstruct Environment: Environment healthy.
Launched Version: 1.7.10-Forge10.13.2.1291
LWJGL: 2.9.1
OpenGL: Intel(R) HD Graphics 4400 GL version 4.3.0 - Build 10.18.10.3960, Intel
GL Caps: Using GL 1.3 multitexturing.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Anisotropic filtering is supported and maximum anisotropy is 16.
Shaders are available because OpenGL 2.1 is supported.

Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Resource Packs: []
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Anisotropic Filtering: On (8)

Problem has been solved.

Have the same problem, just install latest Forge