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I recently downloaded flans mod and installed a new airplane pack, every time i place a airplane or car i get this,
java.lang.NullPointerException
at co.uk.flansmods.common.driveables.EntityPlane.func_70071_h_(EntityPlane.java:491)
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:129)
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 co.uk.flansmods.common.driveables.EntityPlane.func_70071_h_(EntityPlane.java:491)
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: Plane (co.uk.flansmods.common.driveables.EntityPlane)
Entity ID: 8150
Entity Name: Two Seat Biplane
Entity's Exact location: 1.50, 238.50, 3.50
Entity's Block location: World: (1,238,3), Chunk: (at 1,14,3 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
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: flans planes!
All players: 1 total; [EntityPlayerMP['colbytherocker'/14, l='flans planes!', x=-1.98, y=237.00, z=3.22]]
Chunk stats: ServerChunkCache: 625 Drop: 0
Level seed: -8589054456812100692
Level generator: ID 01 - flat, ver 0. Features enabled: true
Level generator options: 2;7,230x1,5x3,2;3;stronghold,biome_1,dungeon,mineshaft
Level spawn location: World: (0,4,0), Chunk: (at 0,0,0 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 3339 game time, 3339 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 55013 (now: false), thunder time: 20475 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
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:129)
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: Linux (i386) version 3.2.0-58-generic-pae
Java Version: 1.7.0_51, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 83881688 bytes (79 MB) / 422154240 bytes (402 MB) up to 518979584 bytes (494 MB)
JVM Flags: 1 total; -Xmx512M
AABB Pool Size: 758 (42448 bytes; 0 MB) allocated, 227 (12712 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v8.11 FML v6.4.49.965 Minecraft Forge 9.11.1.965 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{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
FlansMod{4.1} [Flans Mod] (FlansMod-4.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Profiler Position: N/A (disabled)
Vec3 Pool Size: 50 (2800 bytes; 0 MB) allocated, 29 (1624 bytes; 0 MB) used
Player Count: 1 / 8; [EntityPlayerMP['colbytherocker'/14, l='flans planes!', x=-1.98, y=237.00, z=3.22]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'

Can someone please help me!