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Here's the full report:

Time: 12/20/15 5:29 AM
Description: Initializing game

java.lang.IllegalArgumentException: ID is already registered: 132
at net.minecraft.entity.EntityList.func_75618_a(EntityList.java:94)
at cpw.mods.fml.common.registry.EntityRegistry.registerGlobalEntityID(EntityRegistry.java:199)
at com.flansmod.common.FlansMod.init(FlansMod.java:233)
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 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:483)
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:483)
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:737)
at cpw.mods.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:311)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:552)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:878)
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)

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

-- Head --
Stacktrace:
at net.minecraft.entity.EntityList.func_75618_a(EntityList.java:94)
at cpw.mods.fml.common.registry.EntityRegistry.registerGlobalEntityID(EntityRegistry.java:199)
at com.flansmod.common.FlansMod.init(FlansMod.java:233)
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 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:483)
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:483)
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:737)
at cpw.mods.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:311)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:552)

-- Initialization --
Details:
Stacktrace:
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:878)
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: 147022392 bytes (140 MB) / 375234560 bytes (357 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 10.13.4.1566 39 mods loaded, 39 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCHI mcp{9.05} [Minecraft Coder Pack] (minecraft.jar)
UCHI FML{7.10.99.99} [Forge Mod Loader] (forge-1.7.10-10.13.4.1566-1.7.10.jar)
UCHI Forge{10.13.4.1566} [Minecraft Forge] (forge-1.7.10-10.13.4.1566-1.7.10.jar)
UCHI Micdoodlecore{} [Micdoodle8 Core] (minecraft.jar)
UCHI RenderPlayerAPI{1.0} [Render Player API] (minecraft.jar)
UCHI modJ_StarMinerCore{0.9.8} [StarMinerCore] (minecraft.jar)
UCHI TooManyItems{1.7.10} [TooManyItems] (minecraft.jar)
UCHI mod_ThreadedLighting{1.7.10-1.0} [Threaded Lighting] (minecraft.jar)
UCHI gilded-games-util{1.7.10-1.1} [Gilded Games Utility] (gilded-games-util-1.7.10-1.7.jar)
UCHI GalacticraftCore{3.0.12} [Galacticraft Core] (GalacticraftCore-1.7-3.0.12.404.jar)
UCHI SpaceCore{4.1.9} [4Space Core] (4Space-4.1.9.jar)
UCHI ExoCore{0.1.2} [4Space Exoplanets Core] (4Space-4.1.9.jar)
UCHI ExoElipse{0.1.2} [4Space Exoplanets Elipse] (4Space-4.1.9.jar)
UCHI SpaceCallisto{4.1.9} [4Space Callisto] (4Space-4.1.9.jar)
UCHI SpaceEuropa{4.1.9} [4Space Europa] (4Space-4.1.9.jar)
UCHE SpaceVenus{4.1.9} [4Space Venus] (4Space-4.1.9.jar)
UCHE SpaceIo{4.1.9} [4Space Io] (4Space-4.1.9.jar)
UCHI SpaceMercury{4.1.9} [4Space Mercury] (4Space-4.1.9.jar)
UCHI SpacePluto{4.1.9} [4Space Pluto] (4Space-4.1.9.jar)
UCHI lucky{5.1.0} [Lucky Block] ([1-7-10]_Lucky_Block_v5-1-0.jar)
UCHI DamageIndicatorsMod{3.2.3} [Damage Indicators] ([1.7.10]DamageIndicatorsMod-3.2.3.jar)
UCHI animalbikes{1.7.10} [Animal Bikes] (AnimalBikes_1.7.10.jar)
UCHI chancecubes{1.7.10-1.3.6.29} [Chance Cubes] (ChanceCubes-1.7.10-1.3.6.29.jar)
UCHI thedalekmod{39.75} [The Dalek Mod] (Dalek_Mod_1710.jar)
UCHI eplus{3.0.2-d} [Enchanting Plus] (EnchantingPlus-1.7.10-3.0.2-d.jar)
UCHE flansmod{4.10.0} [Flan's Mod] (Flans Mod-1.7.10-4.10.0.jar)
UCHI GalacticraftMars{3.0.12} [Galacticraft Planets] (Galacticraft-Planets-1.7-3.0.12.404.jar)
UCHI ModGeochests{1.2.3} [§aGeochests] (geochests-1.7.10-v1.2.3.jar)
UCHI iChunUtil{4.2.2} [iChunUtil] (iChunUtil-4.2.2.jar)
UCHI GraviGun{4.0.0-beta} [GraviGun] (GravityGun-4.0.0-beta.jar)
UCHI Hats{4.0.1} [Hats] (Hats-4.0.1.jar)
UCHI interfaceplus{1.2.1} [InterfacePlus] (InterfacePlus-1.2.1.jar)
UCHI moreplayermodels{1.7.10b} [MorePlayerModels] (MorePlayerModels_1.7.10b.jar)
UCHI MSM3{3.0.0d} [More Swords 3] (MSM-SNAP-3.0.0e-For-MC-1.7.10.jar)
UCHI PortalGun{4.0.0-beta-5} [PortalGun] (PortalGun-4.0.0-beta-5.jar)
UCHI rivalrebels{1.7.10J} [Rival Rebels] (rivalrebels-1.7.10J.jar)
UCHI modJ_StarMiner{0.9.8bf1} [Starminer Mod] (Starminer1710-0.9.8bf1.jar)
UCHI sureen{1.7.10-1.0} [Sureen Core] (Sureen-Core-1.6.jar)
UCHI weirdthingsmod{0.4 ALPHA} [Weird Things Mod] (Weird-Things-Mod-1.7.10.jar)
GL info: ' Vendor: 'ATI Technologies Inc.' Version: '4.4.12874 Compatibility Profile Context 14.100.0.0' Renderer: 'AMD Radeon HD 7700 Series'
Launched Version: 1.7.10-Forge10.13.4.1566-1.7.10
LWJGL: 2.9.1
OpenGL: AMD Radeon HD 7700 Series GL version 4.4.12874 Compatibility Profile Context 14.100.0.0, ATI Technologies Inc.
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)

It doesn't say what my mods are doing to Minecraft. It just says that there's an ID that's occupied.

Actually, I downloaded it a couple of months ago. It worked fine. But, I'll experiment to see what's right.

Looks like the Venus and Io were part of 4Space. That caused a problem. I had to delete that mod, which worked! Thanks ChaosTheDude!