Hello Spigot Community

I recently hosted a minecraft server ! I am running Spigot 1.8.8 but my server stops after some hours

LOGS

17 more
07.10 22:56:02 [Multicraft] Skipped 31 lines due to rate limit (30/s)
07.10 22:56:02 [Server] ERROR The server has stopped responding!
07.10 22:56:02 [Server] ERROR Please report this to http://www.spigotmc.org/
07.10 22:56:02 [Server] ERROR Be sure to include ALL relevant console errors and Minecraft crash reports
07.10 22:56:02 [Server] ERROR Spigot version: git-Spigot-db6de12-18fbb24 (MC: 1.8.8)
07.10 22:56:02 [Server] ERROR ------------------------------
07.10 22:56:02 [Server] ERROR Server thread dump (Look for plugins here before reporting to Spigot!):
07.10 22:56:02 [Server] ERROR ------------------------------
07.10 22:56:02 [Server] ERROR Current Thread: Server thread
07.10 22:56:02 [Server] ERROR PID: 15 | Suspended: false | Native: false | State: RUNNABLE
07.10 22:56:02 [Server] ERROR Stack:
07.10 22:56:02 [Server] ERROR sun.misc.FloatingDecimal$BinaryToASCIIBuffer.developLongDigits(FloatingDecimal.java:392)
07.10 22:56:02 [Server] ERROR sun.misc.FloatingDecimal$BinaryToASCIIBuffer.dtoa(FloatingDecimal.java:476)
07.10 22:56:02 [Server] ERROR sun.misc.FloatingDecimal$BinaryToASCIIBuffer.access$100(FloatingDecimal.java:259)
07.10 22:56:02 [Server] ERROR sun.misc.FloatingDecimal.getBinaryToASCIIConverter(FloatingDecimal.java:1785)
07.10 22:56:02 [Server] ERROR sun.misc.FloatingDecimal.getBinaryToASCIIConverter(FloatingDecimal.java:1738)
07.10 22:56:02 [Server] ERROR sun.misc.FloatingDecimal.appendTo(FloatingDecimal.java:89)
07.10 22:56:02 [Server] ERROR java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:709)
07.10 22:56:02 [Server] ERROR java.lang.StringBuilder.append(StringBuilder.java:226)
07.10 22:56:02 [Server] ERROR fr.xephi.authme.cache.backup.FileCache.createCache(FileCache.java:110)
07.10 22:56:02 [Server] ERROR fr.xephi.authme.listener.AuthMePlayerListener.onPlayerJoin(AuthMePlayerListener.java:675)
07.10 22:56:02 [Server] ERROR sun.reflect.GeneratedMethodAccessor551.invoke(Unknown Source)
07.10 22:56:02 [Server] ERROR sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
07.10 22:56:02 [Server] ERROR java.lang.reflect.Method.invoke(Method.java:498)
07.10 22:56:02 [Server] ERROR org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306)
07.10 22:56:02 [Server] ERROR org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
07.10 22:56:02 [Server] ERROR org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502)
07.10 22:56:02 [Server] ERROR org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487)
07.10 22:56:02 [Server] ERROR net.minecraft.server.v1_8_R3.PlayerList.onPlayerJoin(PlayerList.java:298)
07.10 22:56:02 [Server] ERROR net.minecraft.server.v1_8_R3.PlayerList.a(PlayerList.java:157)
07.10 22:56:02 [Server] ERROR net.minecraft.server.v1_8_R3.LoginListener.b(LoginListener.java:144)
07.10 22:58:17 [Multicraft] Skipped 339 lines due to rate limit (30/s)
07.10 22:58:17 [Server] INFO GroupManager - INFO - Data files refreshed.
07.10 23:00:07 [Multicraft] Auto-saving world...
07.10 23:06:06 [Multicraft] Received restart command
07.10 23:06:06 [Multicraft] Stopping server!
07.10 23:07:08 [Multicraft] Terminating server via signal
07.10 23:07:08 [Server] INFO Stopping server