Need help With Errors

[KingSkulz]

Hello I keep on getting this error if anyone could help me that would be awesome

 

2015-03-14 02:14:46 [sEVERE] java.util.ConcurrentModificationException
2015-03-14 02:14:46 [sEVERE]  at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:859)
2015-03-14 02:14:46 [sEVERE]  at java.util.ArrayList$Itr.next(ArrayList.java:831)
2015-03-14 02:14:46 [sEVERE]  at net.minecraft.server.World.getTileEntity(World.java:1644)
2015-03-14 02:14:46 [sEVERE]  at net.minecraft.server.WorldServer.getTileEntity(WorldServer.java:45)
2015-03-14 02:14:46 [sEVERE]  at eloraam.core.TubeLib.isConSide(TubeLib.java:303)
2015-03-14 02:14:46 [sEVERE]  at eloraam.core.TubeLib.getConnections(TubeLib.java:375)
2015-03-14 02:14:46 [sEVERE]  at eloraam.core.TubeLib$RouteFinder.find(TubeLib.java:222)
2015-03-14 02:14:46 [sEVERE]  at eloraam.core.TubeLib.findRoute(TubeLib.java:398)
2015-03-14 02:14:46 [sEVERE]  at eloraam.machine.TileTube$1.schedule(TileTube.java:51)
2015-03-14 02:14:46 [sEVERE]  at eloraam.core.TubeFlow.update(TubeFlow.java:76)
2015-03-14 02:14:46 [sEVERE]  at eloraam.machine.TileTube.q_(TileTube.java:227)
2015-03-14 02:14:46 [sEVERE]  at net.minecraft.server.World.tickEntities(World.java:1190)
2015-03-14 02:14:46 [sEVERE]  at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:569)
2015-03-14 02:14:46 [sEVERE]  at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:467)
2015-03-14 02:14:46 [sEVERE]  at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)
2015-03-14 02:14:46 [sEVERE] Unexpected exception
java.util.ConcurrentModificationException
 at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:859)
 at java.util.ArrayList$Itr.next(ArrayList.java:831)
 at net.minecraft.server.World.getTileEntity(World.java:1644)
 at net.minecraft.server.WorldServer.getTileEntity(WorldServer.java:45)
 at eloraam.core.TubeLib.isConSide(TubeLib.java:303)
 at eloraam.core.TubeLib.getConnections(TubeLib.java:375)
 at eloraam.core.TubeLib$RouteFinder.find(TubeLib.java:222)
 at eloraam.core.TubeLib.findRoute(TubeLib.java:398)
 at eloraam.machine.TileTube$1.schedule(TileTube.java:51)
 at eloraam.core.TubeFlow.update(TubeFlow.java:76)
 at eloraam.machine.TileTube.q_(TileTube.java:227)
 at net.minecraft.server.World.tickEntities(World.java:1190)
 at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:569)
 at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:467)
 at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)