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I recently started making a modpack for my friends and I. I create a world, all is good. But when I buy a familar and try to put it on, my minecraft crashes, and I get this error log. Any help would be appreciated.

---- Minecraft Crash Report ----
// Surprise! Haha. Well, this is awkward.

Time: 7/16/14 6:02 PM
Description: Ticking entity

java.lang.NullPointerException
at am2.playerextensions.ExtendedProperties.getMaxMana(ExtendedProperties.java:239)
at am2.playerextensions.ExtendedProperties.manaBurnoutTick(ExtendedProperties.java:931)
at am2.AMEventHandler.onEntityLiving(AMEventHandler.java:326)
at net.minecraftforge.event.ASMEventHandler_96_AMEventHandler_onEntityLiving_LivingUpdateEvent.invoke(.dynamic)
at net.minecraftforge.event.ASMEventHandler.invoke(ASMEventHandler.java:39)
at net.minecraftforge.event.EventBus.post(EventBus.java:108)
at net.minecraftforge.common.ForgeHooks.onLivingUpdate(ForgeHooks.java:337)
at net.minecraft.entity.EntityLivingBase.func_70071_h_(EntityLivingBase.java:1776)
at net.minecraft.entity.EntityLiving.func_70071_h_(EntityLiving.java:257)
at net.minecraft.world.World.func_72866_a(World.java:2350)
at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:719)
at net.minecraft.world.World.func_72870_g(World.java:2311)
at net.minecraft.world.World.func_72939_s(World.java:2157)
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:550)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:668)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:587)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:175)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:484)
at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:583)


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

-- Head --
Stacktrace:
at am2.playerextensions.ExtendedProperties.getMaxMana(ExtendedProperties.java:239)
at am2.playerextensions.ExtendedProperties.manaBurnoutTick(ExtendedProperties.java:931)
at am2.AMEventHandler.onEntityLiving(AMEventHandler.java:326)
at net.minecraftforge.event.ASMEventHandler_96_AMEventHandler_onEntityLiving_LivingUpdateEvent.invoke(.dynamic)
at net.minecraftforge.event.ASMEventHandler.invoke(ASMEventHandler.java:39)
at net.minecraftforge.event.EventBus.post(EventBus.java:108)
at net.minecraftforge.common.ForgeHooks.onLivingUpdate(ForgeHooks.java:337)
at net.minecraft.entity.EntityLivingBase.func_70071_h_(EntityLivingBase.java:1776)
at net.minecraft.entity.EntityLiving.func_70071_h_(EntityLiving.java:257)
at net.minecraft.world.World.func_72866_a(World.java:2350)
at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:719)
at net.minecraft.world.World.func_72870_g(World.java:2311)

-- Entity being ticked --
Details:
Entity Type: FamiliarsExtendedFamPack.Familiar 1UP (mods.Familiars.ExtendedFamPack.common.entity.Familiar1Up)
Entity ID: 6897
Entity Name: entity.FamiliarsExtendedFamPack.Familiar 1UP.name
Entity's Exact location: -151.44, 69.00, 247.95
Entity's Block location: World: (-152,69,247), Chunk: (at 8,4,7 in -10,15; contains blocks -160,0,240 to -145,255,255), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Entity's Momentum: 0.00, 0.00, 0.00
Stacktrace:
at net.minecraft.world.World.func_72939_s(World.java:2157)
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:550)

-- Affected level --
Details:
Level name: New Worldqwrweq
All players: 1 total; [EntityPlayerMP['JohnKramarevskiy'/198, l='New Worldqwrweq', x=-151.44, y=70.00, z=247.95]]
Chunk stats: ServerChunkCache: 635 Drop: 0
Level seed: -6479302698602852107
Level generator: ID 04 - BIOMESOP, ver 0. Features enabled: true
Level generator options:
Level spawn location: World: (-157,64,241), Chunk: (at 3,4,1 in -10,15; contains blocks -160,0,240 to -145,255,255), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Level time: 902 game time, 902 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 40243 (now: false), thunder time: 147222 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:668)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:587)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:175)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:484)
at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:583)

-- System Details --
Details:
Minecraft Version: 1.6.4
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_51, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 242649776 bytes (231 MB) / 643301376 bytes (613 MB) up to 954728448 bytes (910 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
AABB Pool Size: 7987 (447272 bytes; 0 MB) allocated, 4549 (254744 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 108, allocated: 1, tallocated: 59
FML: MCP v8.11 FML v6.4.49.965 Minecraft Forge 9.11.1.965 Optifine OptiFine_1.6.4_HD_U_D1 33 mods loaded, 33 mods active
mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{6.4.49.965} [Forge Mod Loader] (minecraftforge-9.11.1.965.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{9.11.1.965} [Minecraft Forge] (minecraftforge-9.11.1.965.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CodeChickenCore{0.9.0.9} [CodeChicken Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
NotEnoughItems{1.6.1.9} [Not Enough Items] (NotEnoughItems-1.6.4-1.6.1.9-universal.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FamiliarsAPI{1.6.4} [Familiars API] (Familiars_API_1.6.4a.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
GrimoireGaia2{1.8.2} [§2Grimoire of Gaia 2] ([1.6.4]GrimoireofGaia2(1.8.2c).zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
arsmagica2{1.1.2} [Ars Magica 2] (AM2_1.1.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Backpack{1.28.37} [Backpack] (backpack-1.28.37-1.6.x.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BiblioCraft{1.5.5} [BiblioCraft] (BiblioCraft[v1.5.5].zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BiomesOPlenty{1.2.1} [Biomes O' Plenty] (BiomesOPlenty-universal-1.6.4-1.2.1.434.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BackToTheRoots{0.9.3.1} [Butterfly Mania] (butterflymania[1.6.4]_universal_v0.9.3.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MoCreatures{6.1.0} [DrZhark's Mo'Creatures Mod] (DrZharks MoCreatures Mod v6.1.0.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
DynamicLights{1.2.8} [Dynamic Lights] (DynamicLights_1.6.4.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
DynamicLights_onFire{1.0.3} [Dynamic Lights on burning] (DynamicLights_1.6.4.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
DynamicLights_creepers{1.0.3} [Dynamic Lights on Creepers] (DynamicLights_1.6.4.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
DynamicLights_dropItems{1.0.5} [Dynamic Lights on ItemEntities] (DynamicLights_1.6.4.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
DynamicLights_entityClasses{1.0.0} [Dynamic Lights on specified Entities] (DynamicLights_1.6.4.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
DynamicLights_mobEquipment{1.0.3} [Dynamic Lights on Mob Equipment] (DynamicLights_1.6.4.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
DynamicLights_flameArrows{1.0.0} [Dynamic Lights on Flame enchanted Arrows] (DynamicLights_1.6.4.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
DynamicLights_otherPlayers{1.0.5} [Dynamic Lights Other Player Light] (DynamicLights_1.6.4.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
DynamicLights_thePlayer{1.0.9} [Dynamic Lights Player Light] (DynamicLights_1.6.4.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FamiliarsDefaultMobPack{1.6.4} [Familiars DefaultMobPack] (Familiars_DefaultMobPack_1.6.4a.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FamiliarsExtendedFamPack{1.6.4} [Familiars ExtendedFamPack] (Familiars_ExtendedFamPack_1.6.4a.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FamiliarsHerobrineFamPack{1.6.4} [Familiars HerobrineFamPack] (Familiars_HerobrineFamPack_1.6.4a.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
flowercraftmod{1.7a} [Flowercraft] (Flowercraftmod 1.7a - 1.6.4 Forge.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
inventorytweaks{1.56} [Inventory Tweaks] (InventoryTweaks-MC1.6.2-1.56-b77.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
SlimevoidLib{2.1.0.0} [Slimevoid Library] (SlimevoidLib-1.6.4-2.1.0.0.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
LittleBlocks{2.2.3.1} [Little Blocks] (LittleBlocks-1.6.4-2.2.3.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
cfm{3.3.4} [MrCrayfish's Furniture Mod] (MrCrayfishFurnitureModv3.3.4(1.6.4).jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Thaumcraft{4.0.4c} [Thaumcraft] (Thaumcraft4.0.4c.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
TwilightForest{1.20.5} [The Twilight Forest] (twilightforest-1.6.4-1.20.5.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Waila{1.5.2a} [Waila] (Waila_1.5.2a.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Profiler Position: N/A (disabled)
Vec3 Pool Size: 3007 (168392 bytes; 0 MB) allocated, 2588 (144928 bytes; 0 MB) used
Player Count: 1 / 8; [EntityPlayerMP['JohnKramarevskiy'/198, l='New Worldqwrweq', x=-151.44, y=70.00, z=247.95]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'