[22:09:37] [Server thread/WARN]: net.minecraft.server.v1_8_R3.ExceptionWorldConflict: The save for world located at ./BuildBattle01 is being accessed from another location, aborting
[22:09:37] [Server thread/WARN]: 	at net.minecraft.server.v1_8_R3.WorldNBTStorage.checkSession(WorldNBTStorage.java:72)
[22:09:37] [Server thread/WARN]: 	at net.minecraft.server.v1_8_R3.World.checkSession(World.java:2989)
[22:09:37] [Server thread/WARN]: 	at net.minecraft.server.v1_8_R3.WorldServer.a(WorldServer.java:975)
[22:09:37] [Server thread/WARN]: 	at net.minecraft.server.v1_8_R3.WorldServer.save(WorldServer.java:947)
[22:09:37] [Server thread/WARN]: 	at org.bukkit.craftbukkit.v1_8_R3.CraftWorld.save(CraftWorld.java:771)
[22:09:37] [Server thread/WARN]: 	at org.bukkit.craftbukkit.v1_8_R3.CraftWorld.save(CraftWorld.java:762)
[22:09:37] [Server thread/WARN]: 	at es.minetsii.BuildBattle.BuildBattle$1.run(BuildBattle.java:587)
[22:09:37] [Server thread/WARN]: 	at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:71)
[22:09:37] [Server thread/WARN]: 	at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:350)
[22:09:37] [Server thread/WARN]: 	at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:780)
[22:09:37] [Server thread/WARN]: 	at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:378)
[22:09:37] [Server thread/WARN]: 	at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:711)
[22:09:37] [Server thread/WARN]: 	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:614)
[22:09:37] [Server thread/WARN]: 	at java.lang.Thread.run(Thread.java:745)