[[Unsolved] Crashing after game loads]

I'm playing singleplayer, creative and a little bit after the world loads, I get an error that looks like this:

[Railcraft] Loaded 0 saved Anchors

setupTexture: "/mob/cow.png", id: 106

setupTexture: "/mob/chicken.png", id: 107

[Railcraft] Loaded 0 saved Anchors

setupTexture: "/mob/zombie.png", id: 108

setupTexture: "/mob/skeleton.png", id: 109

setupTexture: "/particles.png", id: 110

setupTexture: "/item/largechest.png", id: 111

setupTexture: "/gui/allitems.png", id: 112

setupTexture: "/codechicken/nei/nei_sprites.png", id: 113

setupTexture: "/mob/villager_golem.png", id: 114

setupTexture: "/mob/slime.png", id: 115

setupTexture: "/mob/silverfish.png", id: 116

setupTexture: "/mob/fire.png", id: 117

setupTexture: "/mob/lava.png", id: 118

setupTexture: "/mob/wolf.png", id: 119

setupTexture: "/mob/ozelot.png", id: 120

setupTexture: "/mob/villager/farmer.png", id: 121

setupTexture: "/mob/creeper.png", id: 122

setupTexture: "/mob/spider.png", id: 123

setupTexture: "/mob/spider_eyes.png", id: 124

setupTexture: "/mob/ghast.png", id: 125

setupTexture: "/mob/pigzombie.png", id: 126

setupTexture: "/mob/cavespider.png", id: 127

setupTexture: "/mob/redcow.png", id: 128

setupTexture: "/item/chest.png", id: 129

setupTexture: "/ee/art/sprites/condenser.png", id: 130

setupTexture: "/gui/crafting.png", id: 131

setupTexture: "/mob/sheep.png", id: 132

setupTexture: "/mob/sheep_fur.png", id: 133

Field not found: nn.captureDrops

Field not found: nn.capturedDrops

java.lang.NullPointerException

    at acq.a(EntityLiving.java:1094)

    at acq.a(EntityLiving.java:887)

    at bc.a(SourceFile:124)

    at yo.c(SourceFile:251)

    at ax.e(SourceFile:77)

    at nb.a(SourceFile:55)

    at acq.s_(EntityLiving.java:1605)

    at acq.e(EntityLiving.java:1452)

    at ajr.e(SourceFile:39)

    at bc.e(SourceFile:30)

    at yo.e(SourceFile:143)

    at acq.J_(EntityLiving.java:687)

    at yo.J_(SourceFile:155)

    at xd.a(World.java:2196)

    at xd.f(World.java:2167)

    at xd.n(World.java:2049)

    at net.minecraft.client.Minecraft.k(Minecraft.java:1871)

    at net.minecraft.client.Minecraft.x(Minecraft.java:825)

    at net.minecraft.client.Minecraft.run(Minecraft.java:753)

    at java.lang.Thread.run(Unknown Source)

2013-06-30 18:06:26 [sEVERE] A critical error has occurred.

java.lang.NullPointerException

    at acq.a(EntityLiving.java:1094)

    at acq.a(EntityLiving.java:887)

    at bc.a(SourceFile:124)

    at yo.c(SourceFile:251)

    at ax.e(SourceFile:77)

    at nb.a(SourceFile:55)

    at acq.s_(EntityLiving.java:1605)

    at acq.e(EntityLiving.java:1452)

    at ajr.e(SourceFile:39)

    at bc.e(SourceFile:30)

    at yo.e(SourceFile:143)

    at acq.J_(EntityLiving.java:687)

    at yo.J_(SourceFile:155)

    at xd.a(World.java:2196)

    at xd.f(World.java:2167)

    at xd.n(World.java:2049)

    at net.minecraft.client.Minecraft.k(Minecraft.java:1871)

    at net.minecraft.client.Minecraft.x(Minecraft.java:825)

    at net.minecraft.client.Minecraft.run(Minecraft.java:753)

    at java.lang.Thread.run(Unknown Source)

2013-06-30 18:06:26 [sEVERE] 41 mods loaded

Optifine OptiFine_1.2.5_HD_S_C6

Minecraft Forge 3.3.8.164

FML v2.2.106.176

Forge Mod Loader version 2.2.106.176 for Minecraft 1.2.5

    mod_CodeChickenCore : Available (modpack.jar)

    mod_MinecraftForge : Available (modpack.jar)

    mod_NotEnoughItems : Available (modpack.jar)

    mod_ReiMinimap : Available ([1.2.5]ReiMinimap_v3.2_04.zip)

    mod_IC2 : Available (industrialcraft-2-client_1.97.jar)

    mod_IC2AdvancedMachines : Available (AdvancedMachines_4.0_client.zip)

    mod_BuildCraftCore : Available (buildcraft-client-A-core-2.2.14.zip)

    mod_BuildCraftBuilders : Available (buildcraft-client-B-builders-2.2.14.zip)

    mod_BuildCraftEnergy : Available (buildcraft-client-B-energy-2.2.14.zip)

    mod_BuildCraftFactory : Available (buildcraft-client-B-factory-2.2.14.zip)

    mod_BuildCraftTransport : Available (buildcraft-client-B-transport-2.2.14.zip)

    mod_AdditionalPipes : Available (buildcraft-client-DA-additionalpipes-2.1.3.zip)

    mod_ComputerCraft : Available (ComputerCraft)

    mod_RedPowerMachine : Available (RedPowerMachine-2.0pr5b2.zip)

    mod_ccSensors : Available (ccSensors-client-MC125-B017pr1.zip)

    mod_CCTurtle : Available (ComputerCraft)

    mod_EE : Available (EE2ClientV1.4.6.5.jar)

    mod_EnderStorage : Available (EnderStorage-Client 1.1.3.zip)

    mod_IC2NuclearControl : Available (IC2NuclearControl_client_v1.1.10b.zip)

    mod_ImmibisCore : Available (immibis-core_49.1.1_for_1.2.5-client.jar)

    mod_InvTweaks : Available (InvTweaks-1.41b-1.2.4.zip)

    mod_MAtmos_forModLoader : Available (MAtmos_packaged.zip)

    mod_ModularForceFieldSystem : Available (mffs_rev7_for_1.2.5-client.zip)

    mod_IC2_ChargingBench : Available (mod_chargingbench-client-1.95b-1.2.5-r1.zip)

    mod_CompactSolars : Available (mod_compactsolars-client-2.3.2.10.zip)

    mod_IronChest : Available (mod_ironchests-client-3.8.0.40.zip)

    mod_RedPowerCore : Available (RedPowerCore-2.0pr5b2.zip)

    mod_NetherOres : Available (NetherOres_Client_1.2.1.zip)

    mod_PowerConverters : Available (PowerConverters_Client_1.3.4.zip)

    mod_Railcraft : Available (Railcraft_Client_5.3.3.zip)

    mod_RedPowerControl : Available (RedPowerControl-2.0pr5b2.zip)

    mod_RedPowerLighting : Available (RedPowerLighting-2.0pr5b2.zip)

    mod_RedPowerLogic : Available (RedPowerLogic-2.0pr5b2.zip)

    mod_RedPowerWiring : Available (RedPowerWiring-2.0pr5b2.zip)

    mod_RedPowerWorld : Available (RedPowerWorld-2.0pr5b2.zip)

    mod_TubeStuff : Available (tubestuff_49.1.2_for_1.2.5-client.jar)

    Balkon's WeaponMod : Available (WeaponMod.zip)

    mod_WirelessRedstoneCore : Available (WR-CBE Core-Client 1.2.2.3.zip)

    mod_WirelessRedstoneAddons : Available (WR-CBE Addons-Client 1.2.2.3.zip)

    mod_WirelessRedstoneRedPower : Available (WR-CBE RedPower-Client 1.2.2.1.zip)

    mod_ImmiChunkLoaders : Available (zdimensional-anchor_rev3.2_for_1.2.5-client.jar)

If you have found another thread where this is explained, please link me to it, as well.

Thank you.

Also, this does not happen in survival multiplayer.