I recently installed movecraft on my server, and I configured my first ship, called an Aircraft. Everything works well, it calculates the correct percentages of required blocks (wool for me), and when I place the sign to mark it a craft and click it, it says I am piloting the craft. However, when I try to move, it says my path is obstructed, even when it is not. On the rare occasion that it does not say that, I move one block at a time but the ship does not move. I get this error in the console: 20:51:49 [WARNING] [Movecraft] Task #982 for Movecraft v3.1.25 generated an exception java.lang.NoClassDefFoundError: org/bukkit/craftbukkit/v1_5_R2/CraftChunk at net.countercraft.movecraft.utils.MapUpdateManager.run(MapUpdateManager.java:92) at org.bukkit.craftbukkit.v1_5_R3.scheduler.CraftTask.run(CraftTask.java:53) at org.bukkit.craftbukkit.v1_5_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:345) at net.minecraft.server.v1_5_R3.MinecraftServer.r(MinecraftServer.java:513) at net.minecraft.server.v1_5_R3.DedicatedServer.r(DedicatedServer.java:226) at net.minecraft.server.v1_5_R3.MinecraftServer.q(MinecraftServer.java:477) at net.minecraft.server.v1_5_R3.MinecraftServer.run(MinecraftServer.java:410) at net.minecraft.server.v1_5_R3.ThreadServerApplication.run(SourceFile:573) This is my movecraft airship.craft config: http://pastebin.com/h22RibdZ All the materials on the ship are listed in the approved list in the airship.craft file, so why is it not working?