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---- Minecraft Crash Report ----
// Daisy, daisy...

Time: 12/12/16 11:36 PM
Description: Starting integrated server

java.lang.NoClassDefFoundError: micdoodle8/mods/galacticraft/core/entities/player/GCEntityPlayerMP
at net.minecraft.server.integrated.IntegratedServer.<init>(IntegratedServer.java:50)
at net.minecraft.client.Minecraft.func_71371_a(Minecraft.java:2091)
at net.minecraft.client.gui.GuiCreateWorld.func_146284_a(GuiCreateWorld.java:230)
at net.minecraft.client.gui.GuiScreen.func_73864_a(GuiScreen.java:225)
at net.minecraft.client.gui.GuiCreateWorld.func_73864_a(GuiCreateWorld.java:377)
at net.minecraft.client.gui.GuiScreen.func_146274_d(GuiScreen.java:296)
at net.minecraft.client.gui.GuiScreen.func_146269_k(GuiScreen.java:268)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1640)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:973)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:898)
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.GCEntityPlayerMP
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)
... 17 more
Caused by: java.lang.NullPointerException

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

-- Head --
Stacktrace:
at net.minecraft.server.integrated.IntegratedServer.<init>(IntegratedServer.java:50)

-- Starting integrated server --
Details:
Level ID: New World---
Level Name: New World
Stacktrace:
at net.minecraft.client.Minecraft.func_71371_a(Minecraft.java:2091)
at net.minecraft.client.gui.GuiCreateWorld.func_146284_a(GuiCreateWorld.java:230)
at net.minecraft.client.gui.GuiScreen.func_73864_a(GuiScreen.java:225)
at net.minecraft.client.gui.GuiCreateWorld.func_73864_a(GuiCreateWorld.java:377)
at net.minecraft.client.gui.GuiScreen.func_146274_d(GuiScreen.java:296)
at net.minecraft.client.gui.GuiScreen.func_146269_k(GuiScreen.java:268)

-- Affected screen --
Details:
Screen name: net.minecraft.client.gui.GuiMainMenu
Stacktrace:
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1640)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:973)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:898)
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 7 (amd64) version 6.1
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 268528328 bytes (256 MB) / 618086400 bytes (589 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 v7.10.99.99 Minecraft Forge 10.13.4.1614 Optifine OptiFine_1.7.10_HD_C1 28 mods loaded, 28 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCHIJA mcp{9.05} [Minecraft Coder Pack] (minecraft.jar)
UCHIJA FML{7.10.99.99} [Forge Mod Loader] (forge-1.7.10-10.13.4.1614-1.7.10.jar)
UCHIJA Forge{10.13.4.1614} [Minecraft Forge] (forge-1.7.10-10.13.4.1614-1.7.10.jar)
UCHIJA modJ_StarMinerCore{0.9.7} [StarMinerCore] (minecraft.jar)
UCHIJA CodeChickenCore{1.0.7.47} [CodeChicken Core] (minecraft.jar)
UCHIJA Micdoodlecore{} [Micdoodle8 Core] (minecraft.jar)
UCHIJA NotEnoughItems{1.0.5.120} [Not Enough Items] (NotEnoughItems-1.7.10-1.0.5.120-universal.jar)
UCHIJA WarpDriveCore{1.7.10-1.3.29.-} [WarpDriveCore] (minecraft.jar)
UCHIJA modJ_StarMiner{0.9.7} [Starminer Mod] (Anti-Gravity-Mod-1.7.10.jar)
UCHIJA ArchimedesShips{1.7.10 v1.7.1} [Archimedes' Ships] (ArchimedesShips-1.7.1.jar)
UCHIJA BiblioCraft{1.11.2} [BiblioCraft] (BiblioCraft[v1.11.2][MC1.7.10].jar)
UCHIJA BiomesOPlenty{2.1.0} [Biomes O' Plenty] (BiomesOPlenty-1.7.10-2.1.0.2027-universal.jar)
UCHIJA ComputerCraft{1.75} [ComputerCraft] (ComputerCraft1.75.jar)
UCHIJA cosmeticarmorreworked{1.7.10-v6b} [CosmeticArmorReworked] (CosmeticArmorReworked-1.7.10-v6b.jar)
UCHIJA craftingisabreeze{1.4.4} [Crafting is a Breeze] (craftingisabreeze-1.4.4-[mc-1.7.10].jar)
UCHIJA customnpcs{1.7.10d} [CustomNpcs] (CustomNPCs_1.7.10d(21feb16).jar)
UCHIJA SlimevoidLib{2.0.4.7} [Slimevoid Library] (SlimevoidLibrary-2.0.4.7.jar)
UCHIJA DynamicTransport{0.1.2.0} [Dynamic Transport] (DynamicTransport-0.1.2.0.jar)
UCHIJA ExtraUtilities{1.1.0k} [Extra Utilities] (Extra-Utilities-Mod-1.7.10 (1).jar)
UCHIJA iChunUtil{4.0.0} [iChunUtil] (iChunUtil-4.0.0.jar)
UCHIJA starwarsmod{1.3.3} [Parzi's Star Wars Mod] (Parzi's Star Wars Mod v1.3.3.jar)
UCHIJA RedstonePasteMod{1.6.2} [Redstone Paste] (RedstonePasteMod-1.7.10-1.6.2.jar)
UCHIJA securitycraft{v1.6.1} [SecurityCraft] (SecurityCraft v1.6.0 for 1.7.10.jar)
UCHIJA Waila{1.5.10} [Waila] (Waila-1.5.10_1.7.10.jar)
UCHIJA WarpDrive{1.7.10-1.3.29.-} [WarpDrive] (WarpDrive-1.7.10-1.3.29.-.jar)
UCHIJA waystones{1.0.4} [Waystones] (Waystones-mc1.7.10-1.0.4.jar)
UCHIJA XaeroMinimap{1.11.3} [Xaero's Minimap] (Xaeros_Minimap_1.11.3_Forge_1.7.10.jar)
UCHIJA XaeroWorldMap{1.6} [Xaero's World Map] (XaerosWorldMap_b1.6_Forge_1.7.10.jar)
GL info: ' Vendor: 'NVIDIA Corporation' Version: '4.5.0 NVIDIA 375.70' Renderer: 'GeForce GTX 770/PCIe/SSE2'
Launched Version: 1.7.10-Forge10.13.4.1614-1.7.10
LWJGL: 2.9.1
OpenGL: GeForce GTX 770/PCIe/SSE2 GL version 4.5.0 NVIDIA 375.70, NVIDIA Corporation
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: Off(1)

I have no computer experience, so I have no idea what any of this means, only that it's bad lol... so if anyone understands this plz help me

Have you tried to delete your minecraft and reinstall it? Or, try restarting your computer. Sometimes they're little glitches that can be fixed with a reload.

well, i have tried restarting the computer, but not renstalingminecraft, havn't figured out a way to safely do that without losing minecraft, as i may have mentioned, im not good with computers XD

sooo, i tried it, worked without mods, but as soon as i installed all my mods, it happened again.. and i have no way of telling witch one it is..

I Fixed it! i had a little theory that extra utilities and warp drive did not function well together, so i did what you suggested and reinstalled minecraft, and then i put my mods back in, but when i powered the ship core with the generator from extra utilities it corrupted the game again, so i tried other mods that do the same thing and it all works now ps: thanks for helping me