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java.lang.IndexOutOfBoundsException: Index: 1, Size: 1	at java.util.ArrayList.rangeCheck(ArrayList.java:653)	at java.util.ArrayList.set(ArrayList.java:444)	at net.minecraft.server.v1_7_R4.RegionFile.(RegionFile.java:66)	at net.minecraft.server.v1_7_R4.RegionFileCache.a(RegionFileCache.java:31)	at net.minecraft.server.v1_7_R4.ChunkRegionLoader.chunkExists(ChunkRegionLoader.java:41)	at net.minecraft.server.v1_7_R4.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:115)	at net.minecraft.server.v1_7_R4.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:102)	at org.bukkit.craftbukkit.v1_7_R4.CraftWorld.loadChunk(CraftWorld.java:248)	at com.wimbli.WorldBorder.WorldFillTask.run(WorldFillTask.java:198)	at org.bukkit.craftbukkit.v1_7_R4.scheduler.CraftTask.run(CraftTask.java:71)	at org.bukkit.craftbukkit.v1_7_R4.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:350)	at net.minecraft.server.v1_7_R4.MinecraftServer.v(MinecraftServer.java:641)	at net.minecraft.server.v1_7_R4.DedicatedServer.v(DedicatedServer.java:289)	at net.minecraft.server.v1_7_R4.MinecraftServer.u(MinecraftServer.java:584)	at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:490)	at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628)