Crash de minecraft avec le Flan's Mod

J'arrive a installer le Flan's mod et tout ces packs de jeux mais quand je veux créer un véhicule minecraft crash à chaque fois et j'ai ce message d'erreur sur la console crash report :

Minecraft Crash Report ----
// Why did you do that?

Time: 19/04/14 09:35
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:

Je rajoute aussi que je suis sur mac pour jouer.