[06:02:32] [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 ./MundoRecurso, 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.1.8.8.jar:git-Spigot-db6de12-18fbb24]
   at net.minecraft.server.v1_8_R3.World.checkSession(World.java:2824) ~[spigot.1.8.8.jar:git-Spigot-db6de12-18fbb24]
   at net.minecraft.server.v1_8_R3.ChunkRegionLoader.a(ChunkRegionLoader.java:120) ~[spigot.1.8.8.jar:git-Spigot-db6de12-18fbb24]
   at net.minecraft.server.v1_8_R3.ChunkProviderServer.saveChunk(ChunkProviderServer.java:251) [spigot.1.8.8.jar:git-Spigot-db6de12-18fbb24]
   at net.minecraft.server.v1_8_R3.ChunkProviderServer.unloadChunks(ChunkProviderServer.java:357) [spigot.1.8.8.jar:git-Spigot-db6de12-18fbb24]
   at net.minecraft.server.v1_8_R3.WorldServer.doTick(WorldServer.java:234) [spigot.1.8.8.jar:git-Spigot-db6de12-18fbb24]
   at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:770) [spigot.1.8.8.jar:git-Spigot-db6de12-18fbb24]
   at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [spigot.1.8.8.jar:git-Spigot-db6de12-18fbb24]
   at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [spigot.1.8.8.jar:git-Spigot-db6de12-18fbb24]
   at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [spigot.1.8.8.jar:git-Spigot-db6de12-18fbb24]
   at java.lang.Thread.run(Thread.java:748) [?:1.8.0_191]
[06:15:22] [File IO Thread/ERROR]: Failed to save chunk
java.lang.NullPointerException
[06:15:22] [File IO Thread/ERROR]: Failed to save chunk
java.lang.NullPointerException
[06:15:22] [File IO Thread/ERROR]: Failed to save chunk
java.lang.NullPointerException
[06:15:24] [File IO Thread/ERROR]: Failed to save chunk
java.lang.NullPointerException
[06:15:24] [File IO Thread/ERROR]: Failed to save chunk
java.lang.NullPointerException
[06:15:24] [File IO Thread/ERROR]: Failed to save chunk
java.lang.NullPointerException
[06:15:27] [Netty Epoll Server IO #0/WARN]: An exceptionCaught() event was fired, and it reached at the tail of the pipeline. It usually means the last handler in the pipeline did not handle the exception.
java.io.IOException: Error during accept(...): Too many open files
    at io.netty.channel.epoll.Native.accept(Native Method) ~[spigot.1.8.8.jar:git-Spigot-db6de12-18fbb24]
    at io.netty.channel.epoll.EpollServerSocketChannel$EpollServerSocketUnsafe.epollInReady(EpollServerSocketChannel.java:102) [spigot.1.8.8.jar:git-Spigot-db6de12-18fbb24]
    at io.netty.channel.epoll.EpollEventLoop.processReady(EpollEventLoop.java:326) [spigot.1.8.8.jar:git-Spigot-db6de12-18fbb24]
    at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:264) [spigot.1.8.8.jar:git-Spigot-db6de12-18fbb24]
    at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116) [spigot.1.8.8.jar:git-Spigot-db6de12-18fbb24]
    at java.lang.Thread.run(Thread.java:748) [?:1.8.0_191]