Train carts

2013-04-14 01:43:35 [SEVERE] [Train Carts] Failed to perform physics on train 'train2' at playerworld_-237_63_109:
2013-04-14 01:43:35 [SEVERE] java.lang.RuntimeException: Unloaded members do not have groups!
2013-04-14 01:43:35 [SEVERE]   at com.bergerkiller.bukkit.tc.controller.MinecartMember.getGroup(MinecartMember.java:139)
2013-04-14 01:43:35 [SEVERE]   at com.bergerkiller.bukkit.tc.detector.DetectorRegion.onEnter(DetectorRegion.java:212)
2013-04-14 01:43:35 [SEVERE]   at com.bergerkiller.bukkit.tc.detector.DetectorRegion.add(DetectorRegion.java:229)
2013-04-14 01:43:35 [SEVERE]   at com.bergerkiller.bukkit.tc.detector.DetectorRegion.handleEnter(DetectorRegion.java:70)
2013-04-14 01:43:35 [SEVERE]   at com.bergerkiller.bukkit.tc.detector.DetectorRegion.handleMove(DetectorRegion.java:52)
2013-04-14 01:43:35 [SEVERE]   at com.bergerkiller.bukkit.tc.controller.components.BlockTrackerGroup.refresh(BlockTrackerGroup.java:219)
2013-04-14 01:43:35 [SEVERE]   at com.bergerkiller.bukkit.tc.controller.MinecartGroup.doPhysics(MinecartGroup.java:879)
2013-04-14 01:43:35 [SEVERE]   at com.bergerkiller.bukkit.tc.controller.MinecartGroup.doPhysics(MinecartGroup.java:830)
2013-04-14 01:43:35 [SEVERE]   at com.bergerkiller.bukkit.tc.controller.MinecartGroupStore.doFixedTick(MinecartGroupStore.java:39)
2013-04-14 01:43:35 [SEVERE]   at com.bergerkiller.bukkit.tc.TrainCarts$2.run(TrainCarts.java:448)
2013-04-14 01:43:35 [SEVERE]   at org.bukkit.craftbukkit.v1_5_R2.scheduler.CraftTask.run(CraftTask.java:58)
2013-04-14 01:43:35 [SEVERE]   at org.bukkit.craftbukkit.v1_5_R2.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:344)
2013-04-14 01:43:35 [SEVERE]   ...5 more
2013-04-14 01:44:03 [SEVERE] [Train Carts] Failed to perform physics on train 'train2' at playerworld_-375_70_27:
2013-04-14 01:44:03 [SEVERE] java.lang.RuntimeException: Unloaded members do not have groups!
2013-04-14 01:44:03 [SEVERE]   at com.bergerkiller.bukkit.tc.controller.MinecartMember.getGroup(MinecartMember.java:139)
2013-04-14 01:44:03 [SEVERE]   at com.bergerkiller.bukkit.tc.detector.DetectorRegion.onLeave(DetectorRegion.java:194)
2013-04-14 01:44:03 [SEVERE]   at com.bergerkiller.bukkit.tc.detector.DetectorRegion.remove(DetectorRegion.java:223)
2013-04-14 01:44:03 [SEVERE]   at com.bergerkiller.bukkit.tc.detector.DetectorRegion.handleMove(DetectorRegion.java:46)
2013-04-14 01:44:03 [SEVERE]   at com.bergerkiller.bukkit.tc.controller.components.BlockTrackerGroup.refresh(BlockTrackerGroup.java:219)
2013-04-14 01:44:03 [SEVERE]   at com.bergerkiller.bukkit.tc.controller.MinecartGroup.doPhysics(MinecartGroup.java:893)
2013-04-14 01:44:03 [SEVERE]   at com.bergerkiller.bukkit.tc.controller.MinecartGroup.doPhysics(MinecartGroup.java:830)
2013-04-14 01:44:03 [SEVERE]   at com.bergerkiller.bukkit.tc.controller.MinecartMember.onTick(MinecartMember.java:1097)
2013-04-14 01:44:03 [SEVERE]   at com.bergerkiller.bukkit.common.entity.nms.NMSEntityHookImpl.l_(NMSEntityHookImpl.java:39)
2013-04-14 01:44:03 [SEVERE]   at sun.reflect.GeneratedMethodAccessor59.invoke(Unknown Source)
2013-04-14 01:44:03 [SEVERE]   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
2013-04-14 01:44:03 [SEVERE]   at java.lang.reflect.Method.invoke(Method.java:601)
2013-04-14 01:44:03 [SEVERE]   at com.bergerkiller.bukkit.common.entity.nms.NMSEntityClassBuilder$ProxyCallback.invoke(NMSEntityClassBuilder.java:228)
2013-04-14 01:44:03 [SEVERE]   at com.bergerkiller.bukkit.common.entity.nms.NMSEntityClassBuilder$CallbackMethodInterceptor.intercept(NMSEntityClassBuilder.java:185)
2013-04-14 01:44:03 [SEVERE]   at net.minecraft.server.v1_5_R2.EntityMinecartRideable$$EnhancerByCGLIB$$f0c2d2ef.l_(<generated>)
2013-04-14 01:44:03 [SEVERE]   at net.minecraft.server.v1_5_R2.World.entityJoinedWorld(World.java:1457)
2013-04-14 01:44:03 [SEVERE]   at net.minecraft.server.v1_5_R2.WorldServer.entityJoinedWorld(WorldServer.java:646)
2013-04-14 01:44:03 [SEVERE]   at net.minecraft.server.v1_5_R2.World.playerJoinedWorld(World.java:1433)
2013-04-14 01:44:03 [SEVERE]   at net.minecraft.server.v1_5_R2.World.tickEntities(World.java:1305)
2013-04-14 01:44:03 [SEVERE]   ...6 more