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Server loads fine and all player's can move around freely and damage mobs; but, as soon as someone attempts to break a block, rightclick a block, or open a chest and things of the like, the server crashes. "Internal Server Error" is what the client-side crash receives.

http://pastebin.com/bve3GgTu

The server crashes are problems we fixed, so there are no crash reports. The crashes just cause you to exit the server, but leave Minecraft and the server itself still running.

Server is run by ggservers, hosted in Canada, 3gb of RAM

Hosted with Forge 1.7.10

Mods:

1.7.10 Directory 4 05:02
AgriCraft-1.7.10-1.5.0.
AnimationAPI-1.7.10-1.2.4.
AppleMilkTea2-1.7.10_2.9m.
ArcaneArteries0.7.2.
ArchimedesShips-1.7.1.
Armourers-Workshop-1.7.10-0.40.1.
ArsMagica2 1.7.10 AM2 1.4.0.009..disabled DISABLED
Automagy-1.7.10-0.28.2.
BetterBuildersWands-0.6.1-1.7.10r80+358ee26.
BetterStorage-1.7.10-0.13.1.127.
BiblioCraft[v1.11.5][MC1.7.10].
BiblioWoods[BiomesOPlenty][v1.9].
BiomesOPlenty-1.7.10-2.1.0.2027-universal.
BloodMagic-1.7.10-1.3.3-17.
Bookshelf-1.7.10-1.0.4.187.
Botania r1.8-249.
BrandonsCore-1.0.0.12.
Brewcraft-1.7.10-1.3.3.
Cannibalism-1.3.0-1.7.10.
Carpenter's Blocks v3.3.8.1_dev_r1 - MC 1.7.10.
Chisel-1.7.10-2.9.5.11.
ChocoCraft-4.1.5.
CodeChickenCore-1.7.10-1.0.7.47-universal.
CookieCore-1.7.10-1.4.0-11.
CraftHeraldry 1.1.3.
CustomNPCs_1.7.10d.
DoggyTalents-1.7.10-v1.9.0h-universal.
DummyCore-1.13.
DynamicSurroundings-1.7.10-1.0.5.6.
EnchantingPlus-1.7.10-4.0.0.74.
EvilCraft-1.7.10-0.9.10.
ExtraTiC-1.7.10-1.4.6.
FPSPlus-1.7.10.
FastLeafDecay-1.7.10-1.4.
Forbidden Magic-1.7.10-0.575.
GardenStuff-1.7.10-1.7.0.
GrimoireOfGaia3-1.7.10-1.2.7.
Guide-API-1.7.10-1.0.1-29.
Hide Names-1.7.10-1.1.8.
IguanaTinkerTweaks-1.7.10-2.1.6.
InfernalMobs-1.7.10.
InventoryTweaks-1.59-dev-152.
Jabba-1.2.2_1.7.10.
Lantern1.47[1.7.10].
LevelUp!-0.10(1.7.10).
_Battlegear2-Bullseye-1.0.8.3 1.7.10.
MCA-1.7.10-5.2.2-universal.
Mantle-1.7.10-0.3.2b.
Metallurgy-1.7.10-4.0.9.148.
MetallurgyCore-1.7.10-4.0.5.30.
MineTweaker3-1.7.10-3.0.10B.
Minions-1.7.10.
MorePlayerModels_1.7.10b..disabled DISABLED
Necromancy-1.7.10.
NotEnoughItems-1.7.10-1.0.5.120-universal.
Oceancraft-1.4.1.
PChan3Mods-0.7(1.7.10).
Pam's HarvestCraft 1.7.10j.
ParticleLib - 1.
PlayerAPI-1.7.10-1.4.
RPGAdvMod-1.0.0_1.7.10.
RadixCore-1.7.10-2.1.3-universal.
RedstonePasteMod-1.7.10-1.6.2.
Runic-Dust-Mod-1.7.10-2.0.8.
Sanguine Utilities-1.3.2.
Secret-Rooms-Mod-1.7.10.
SkinPort-1.7.10-v8c.
TConstruct-1.7.10-1.8.8.
TSteelworks-1.7.10-1.1.2-20.
TaintedMagic-1.1.6.4.
Tall-Doors-Mod-1.7.10.
Thaumcraft-1.7.10-4.2.3.5.
ThaumcraftMobAspects-1.7.2-2A.
Thaumic Additions 1.7.10 0.35.
ThaumicExploration-1.7.10-1.1-53.
ThaumicTinkerer-2.5-1.7.10-164.
TheBetweenlands-1.0.6-alpha-universal.
TiCTooltips-mc1.7.10-1.2.5.
Tinkers-Defense-1.2.1.
Torched-4.0.0.
TravellersGear-1.7.10-1.16.6.
Treecapitator-universal-2.0.4-1.7.10.
WIT-1.7.10-1.0.8-1.
adventurebackpack-1.7.10-0.8d-Unofficial2.
balkonsweaponmod-1.14.3.
dmgindicators-3.2.3..disabled_clientonly DISABLED_CLIENTONLY
fastcraft-1.23.
forgeessentials-1.7.10-1.4.4.1187-server.
gadomancy-1.7.10-1.0.7.3.
growthcraft-complete-1.7.10-2.7.2.
iChunUtil-4.2.2.
incharacter-1.0.
inventorypets-1.7.10-1.4.8.1-universal.
journeymap-1.7.10-5.1.4p1-unlimited.
lance-2.6.2.1710.
llibrary-1.7.10-1.5.1.
magicalcrops-4.0.0_PUBLIC_BETA_5.
magicalcropsarmoury-4.0.0_PUBLIC_BETA_4.
magicalcropsdeco-4.0.0_PUBLIC_BETA_4a.
natura-1.7.10-2.2.0.1.
portaportal-0.0.2i.
roguelike-1.7.10-1.5.0b.
supercraftingframe-1.7.10.3.
tcinventoryscan-mc1.7.10-1.0.11.
tcnodetracker-1.7.10-1.1.2.
thaumcraftneiplugin-1.7.10-1.7a.
thaumichorizons-1.7.10-1.1.9.
vending-v1.2.3.
witchery-1.7.10-0.24.1.
world-forge-mc1.7.10-6.0-beta-01.

Well, we can't turn back from them right now. I had $20 and all my friends wanted the server, so that's what we did. They haven't been bad so far, they respond within 24 hours when we have questions. But, the modpack support costs money that we don't have.