Chunks Loading in Black

[Ronz0]

So i Play My own Mod pack that I created for me and my friends(Its just tekkit with stuff added that's why im posting here) and When ever i travel around some chunks will just be black until i walk on them.

Does anyone know whats causing this?

This is my mod pack

http://www.technicpack.net/modpack/details/ronz0.24106

here's a mod list

-Forge mod loader

-Optifine

-Somnia

-Mystcraft

-NotEnoughItems

-Rei's minimap

-Industrialcraft 2

-BuildCraft

-ComputerCraft

-RedPower

-Mo'creatures

-EE2

-EnderStorage

-MAtmos

-IronChest mod

-NetherOres

-Railcraft

-Steves's Carts

-Treecapitator

-Balkon's WeaponMod

-IDResolver

-Thuamcraft

(other small mods/add-ons like thermal expansion and longistics pipes etc...)

-Smart Moving

-Revolver mod

A few of RISUGAMI's Mods:

-Elemental Arrows

-More Stackables

-Sign Tags

-Death Chest

-AudioMod

-EnchantingPlus

-More Enchantments mod

-CustomEMC

-MorePistons mod

-CactusCraft

Please help! thanks

[Ronz0]

sorry picture didnt load for some reason