[13:31:58] [Server thread/ERROR]: Couldn't save chunk; already in use by another instance of Minecraft?
net.minecraft.server.v1_8_R3.ExceptionWorldConflict: Failed to check session lock for world located at ./Ephilia, aborting. Stop the server and delete the session.lock in this world to prevent further issues.
	at net.minecraft.server.v1_8_R3.WorldNBTStorage.checkSession(WorldNBTStorage.java:79) ~[spigot.jar:git-Spigot-6d16e64-3e9b5c9]
	at net.minecraft.server.v1_8_R3.World.checkSession(World.java:2824) ~[spigot.jar:git-Spigot-6d16e64-3e9b5c9]
	at net.minecraft.server.v1_8_R3.ChunkRegionLoader.a(ChunkRegionLoader.java:119) ~[spigot.jar:git-Spigot-6d16e64-3e9b5c9]
	at net.minecraft.server.v1_8_R3.ChunkProviderServer.saveChunk(ChunkProviderServer.java:251) [spigot.jar:git-Spigot-6d16e64-3e9b5c9]
	at net.minecraft.server.v1_8_R3.ChunkProviderServer.unloadChunks(ChunkProviderServer.java:357) [spigot.jar:git-Spigot-6d16e64-3e9b5c9]
	at net.minecraft.server.v1_8_R3.WorldServer.doTick(WorldServer.java:234) [spigot.jar:git-Spigot-6d16e64-3e9b5c9]
	at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:769) [spigot.jar:git-Spigot-6d16e64-3e9b5c9]
	at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [spigot.jar:git-Spigot-6d16e64-3e9b5c9]
	at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:653) [spigot.jar:git-Spigot-6d16e64-3e9b5c9]
	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:556) [spigot.jar:git-Spigot-6d16e64-3e9b5c9]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_151]