I downloaded Flan's mod, on forge 1.7.2 recommended build with the WWII content pack, everything works fine, until I try to place a vehicle, and the game crashes, help? My minecraft is a clean 1.7.2 release, no other mods installed.

---- Minecraft Crash Report ----
// Sorry

Time: 4/20/14 4:47 PM
Description: Ticking entity

java.lang.NullPointerException: Ticking entity
at com.flansmod.common.driveables.EntityVehicle.func_70071_h_(EntityVehicle.java:412)
at net.minecraft.world.World.func_72866_a(World.java:2019)
at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:659)
at net.minecraft.world.World.func_72870_g(World.java:1983)
at net.minecraft.world.World.func_72939_s(World.java:1836)
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:500)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:616)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:527)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:111)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:414)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:665)


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

-- Head --
Stacktrace:
at com.flansmod.common.driveables.EntityVehicle.func_70071_h_(EntityVehicle.java:412)
at net.minecraft.world.World.func_72866_a(World.java:2019)
at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:659)
at net.minecraft.world.World.func_72870_g(World.java:1983)

-- Entity being ticked --
Details:
Entity Type: Vehicle (com.flansmod.common.driveables.EntityVehicle)
Entity ID: 1497
Entity Name: Kubelwagen
Entity's Exact location: -169.50, 80.50, 232.50
Entity's Block location: World: (-170,80,232), Chunk: (at 6,5,8 in -11,14; contains blocks -176,0,224 to -161,255,239), 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:1836)
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:500)

-- Affected level --
Details:
Level name: flan's mod
All players: 1 total; [EntityPlayerMP['n0name85'/250, l='flan's mod', x=-171.98, y=79.00, z=233.74]]
Chunk stats: ServerChunkCache: 857 Drop: 0
Level seed: -1366560824314463069
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (40,64,256), Chunk: (at 8,4,0 in 2,16; contains blocks 32,0,256 to 47,255,271), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 6651 game time, 6651 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 92202 (now: false), thunder time: 49686 (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:616)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:527)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:111)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:414)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:665)

-- System Details --
Details:
Minecraft Version: 1.7.2
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_51, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 137858024 bytes (131 MB) / 504754176 bytes (481 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 1 total; -Xmx1G
AABB Pool Size: 4760 (266560 bytes; 0 MB) allocated, 4595 (257320 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
FML: MCP v9.01-pre FML v7.2.156.1060 Minecraft Forge 10.12.1.1060 4 mods loaded, 4 mods active
mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{7.2.156.1060} [Forge Mod Loader] (forge-1.7.2-10.12.1.1060.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{10.12.1.1060} [Minecraft Forge] (forge-1.7.2-10.12.1.1060.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
flansmod{4.2.3} [flansmod] (Flans Mod-1.7.2-4.2.3.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Profiler Position: N/A (disabled)
Vec3 Pool Size: 952 (53312 bytes; 0 MB) allocated, 814 (45584 bytes; 0 MB) used
Player Count: 1 / 8; [EntityPlayerMP['n0name85'/250, l='flan's mod', x=-171.98, y=79.00, z=233.74]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'