06:05:24 [INFO] Saving chunks for level 'world_myst'/Age 37
06:05:24 [SEVERE] net.minecraft.world.MinecraftException: The save is being accessed from another location, aborting
06:05:24 [SEVERE]       at net.minecraft.world.storage.SaveHandler.func_75762_c(SaveHandler.java:112)
06:05:24 [SEVERE]       at net.minecraft.world.World.func_72906_B(World.java:4243)
06:05:24 [SEVERE]       at net.minecraft.world.WorldServer.func_73042_a(WorldServer.java:1212)
06:05:24 [SEVERE]       at net.minecraft.world.WorldServer.func_73044_a(WorldServer.java:1195)
06:05:24 [SEVERE]       at net.minecraft.server.MinecraftServer.func_71267_a(MinecraftServer.java:548)
06:05:24 [SEVERE]       at net.minecraft.server.MinecraftServer.func_71260_j(MinecraftServer.java:587)
06:05:24 [SEVERE]       at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:734)
06:05:24 [SEVERE]       at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:573)