Here the huge error log:

18:02:41 CONSOLE: ERROR]: The server has stopped responding!
18:02:41 CONSOLE: ERROR]: Please report this to http://www.spigotmc.org/
18:02:41 CONSOLE: ERROR]: Be sure to include ALL relevant console errors and Minecraft crash reports
18:02:41 CONSOLE: ERROR]: Spigot version: git-Spigot-870264a-0a645a2 (MC: 1.8.3)
18:02:41 CONSOLE: ERROR]: ------------------------------
18:02:41 CONSOLE: ERROR]: Server thread dump (Look for plugins here before reporting to Spigot!):
18:02:41 CONSOLE: ERROR]: ------------------------------
18:02:41 CONSOLE: ERROR]: Current Thread: Server thread
18:02:41 CONSOLE: ERROR]: PID: 13 | Suspended: false | Native: true | State: RUNNABLE
18:02:41 CONSOLE: ERROR]: Stack:
18:02:41 CONSOLE: ERROR]: java.net.SocketInputStream.socketRead0(Native Method)
18:02:41 CONSOLE: ERROR]: java.net.SocketInputStream.read(SocketInputStream.java:152)
18:02:41 CONSOLE: ERROR]: java.net.SocketInputStream.read(SocketInputStream.java:122)
18:02:41 CONSOLE: ERROR]: com.mysql.jdbc.util.ReadAheadInputStream.fill(ReadAheadInputStream.java:114)
18:02:41 CONSOLE: ERROR]: com.mysql.jdbc.util.ReadAheadInputStream.readFromUnderlyingStreamIfNecessary(ReadAheadInputStream.java:161)
18:02:41 CONSOLE: ERROR]: com.mysql.jdbc.util.ReadAheadInputStream.read(ReadAheadInputStream.java:189)
18:02:41 CONSOLE: ERROR]: com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:2526)
18:02:41 CONSOLE: ERROR]: com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2979)
18:02:41 CONSOLE: ERROR]: com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2968)
18:02:41 CONSOLE: ERROR]: com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3516)
18:02:41 CONSOLE: ERROR]: com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1986)
18:02:41 CONSOLE: ERROR]: com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2140)
18:02:41 CONSOLE: ERROR]: com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2626)
18:02:41 CONSOLE: ERROR]: com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2111)
18:02:41 CONSOLE: ERROR]: com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:1362)
18:02:41 CONSOLE: ERROR]: com.gmail.nossr50.database.SQLDatabaseManager.saveHuds(SQLDatabaseManager.java:1167)
18:02:41 CONSOLE: ERROR]: com.gmail.nossr50.database.SQLDatabaseManager.saveUser(SQLDatabaseManager.java:135)
18:02:41 CONSOLE: ERROR]: com.gmail.nossr50.datatypes.player.PlayerProfile.save(PlayerProfile.java:68)
18:02:41 CONSOLE: ERROR]: com.gmail.nossr50.listeners.PlayerListener.onPlayerQuit(PlayerListener.java:364)
18:02:41 CONSOLE: ERROR]: sun.reflect.GeneratedMethodAccessor597.invoke(Unknown Source)
18:02:41 CONSOLE: ERROR]: sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
18:02:41 CONSOLE: ERROR]: java.lang.reflect.Method.invoke(Method.java:606)
18:02:41 CONSOLE: ERROR]: org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:301)
18:02:41 CONSOLE: ERROR]: org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
18:02:41 CONSOLE: ERROR]: org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502)
18:02:41 CONSOLE: ERROR]: org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487)
18:02:41 CONSOLE: ERROR]: net.minecraft.server.v1_8_R2.PlayerList.disconnect(PlayerList.java:346)
18:02:41 CONSOLE: ERROR]: net.minecraft.server.v1_8_R2.PlayerConnection.a(PlayerConnection.java:848)
18:02:41 CONSOLE: ERROR]: net.minecraft.server.v1_8_R2.NetworkManager.l(NetworkManager.java:315)
18:02:41 CONSOLE: ERROR]: net.minecraft.server.v1_8_R2.ServerConnection.c(ServerConnection.java:145)
18:02:41 CONSOLE: ERROR]: net.minecraft.server.v1_8_R2.MinecraftServer.A(MinecraftServer.java:811)
18:02:41 CONSOLE: ERROR]: net.minecraft.server.v1_8_R2.DedicatedServer.A(DedicatedServer.java:368)
18:02:41 CONSOLE: ERROR]: net.minecraft.server.v1_8_R2.MinecraftServer.z(MinecraftServer.java:651)
18:02:41 CONSOLE: ERROR]: net.minecraft.server.v1_8_R2.MinecraftServer.run(MinecraftServer.java:554)
18:02:41 CONSOLE: ERROR]: java.lang.Thread.run(Thread.java:744)
18:02:41 CONSOLE: ERROR]: ------------------------------
18:02:41 CONSOLE: ERROR]: Entire Thread Dump:
18:02:41 CONSOLE: ERROR]: ------------------------------
18:02:41 CONSOLE: ERROR]: Current Thread: Async Chat Thread - #6
18:02:41 CONSOLE: ERROR]: PID: 336 | Suspended: false | Native: false | State: WAITING
18:02:41 CONSOLE: ERROR]: Stack:
18:02:41 CONSOLE: ERROR]: java.lang.Object.wait(Native Method)
18:02:41 CONSOLE: ERROR]: org.bukkit.craftbukkit.v1_8_R2.scheduler.CraftFuture.get(CraftFuture.java:54)
18:02:41 CONSOLE: ERROR]: org.bukkit.craftbukkit.v1_8_R2.scheduler.CraftFuture.get(CraftFuture.java:42)
18:02:41 CONSOLE: ERROR]: ch.njol.skript.util.Task.callSync(Task.java:148)
18:02:41 CONSOLE: ERROR]: ch.njol.skript.events.EvtChat$1.execute(EvtChat.java:83)
18:02:41 CONSOLE: ERROR]: org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
18:02:41 CONSOLE: ERROR]: org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502)
18:02:41 CONSOLE: ERROR]: org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:484)
18:02:41 CONSOLE: ERROR]: net.minecraft.server.v1_8_R2.PlayerConnection.chat(PlayerConnection.java:1061)
18:02:44 CONSOLE: ERROR]: java.lang.Object.wait(Native Method)
18:02:44 CONSOLE: ERROR]: org.dynmap.AsynchronousQueue.running(AsynchronousQueue.java:120)
18:02:44 CONSOLE: ERROR]: org.dynmap.AsynchronousQueue.access$000(AsynchronousQueue.java:9)
18:02:44 CONSOLE: ERROR]: org.dynmap.AsynchronousQueue$1.run(AsynchronousQueue.java:83)
18:02:44 CONSOLE: ERROR]: java.lang.Thread.run(Thread.java:744)
18:02:44 CONSOLE: ERROR]: ------------------------------
18:02:44 CONSOLE: ERROR]: Current Thread: Timer-1
18:02:44 CONSOLE: ERROR]: PID: 44 | Suspended: false | Native: false | State: TIMED_WAITING
18:02:44 CONSOLE: ERROR]: Stack:
18:02:44 CONSOLE: ERROR]: java.lang.Object.wait(Native Method)
18:02:44 CONSOLE: ERROR]: java.util.TimerThread.mainLoop(Timer.java:552)
18:02:44 CONSOLE: ERROR]: java.util.TimerThread.run(Timer.java:505)
18:02:44 CONSOLE: ERROR]: ------------------------------
18:02:44 CONSOLE: ERROR]: Current Thread: pool-5-thread-1
18:02:44 CONSOLE: ERROR]: PID: 43 | Suspended: false | Native: false | State: TIMED_WAITING
18:02:44 CONSOLE: ERROR]: Stack:
18:02:44 CONSOLE: ERROR]: sun.misc.Unsafe.park(Native Method)
18:02:44 CONSOLE: ERROR]: java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:226)
18:02:44 CONSOLE: ERROR]: java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2082)
18:02:44 CONSOLE: ERROR]: java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1090)
18:02:44 CONSOLE: ERROR]: java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:807)
18:02:44 CONSOLE: ERROR]: java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1068)
18:02:44 CONSOLE: ERROR]: java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
18:02:44 CONSOLE: ERROR]: java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
18:02:44 CONSOLE: ERROR]: java.lang.Thread.run(Thread.java:744)
18:02:44 CONSOLE: ERROR]: ------------------------------
18:02:44 CONSOLE: ERROR]: Current Thread: pool-4-thread-1
18:02:44 CONSOLE: ERROR]: PID: 42 | Suspended: false | Native: false | State: WAITING
18:02:44 CONSOLE: ERROR]: Stack:
18:02:44 CONSOLE: ERROR]: sun.misc.Unsafe.park(Native Method)
18:02:44 CONSOLE: ERROR]: java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
18:02:44 CONSOLE: ERROR]: java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2043)
18:02:44 CONSOLE: ERROR]: java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1079)
18:02:44 CONSOLE: ERROR]: java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:807)
18:02:44 CONSOLE: ERROR]: java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1068)
18:02:44 CONSOLE: ERROR]: java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
18:02:44 CONSOLE: ERROR]: java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
18:02:44 CONSOLE: ERROR]: java.lang.Thread.run(Thread.java:744)
18:02:44 CONSOLE: ERROR]: ------------------------------
18:02:44 CONSOLE: ERROR]: Current Thread: PoolCleaner[905583751:1432567222928]
18:02:44 CONSOLE: ERROR]: PID: 41 | Suspended: false | Native: false | State: TIMED_WAITING
18:02:44 CONSOLE: ERROR]: Stack:
18:02:44 CONSOLE: ERROR]: java.lang.Object.wait(Native Method)
18:02:44 CONSOLE: ERROR]: java.util.TimerThread.mainLoop(Timer.java:552)
18:02:44 CONSOLE: ERROR]: java.util.TimerThread.run(Timer.java:505)
18:02:44 CONSOLE: ERROR]: ------------------------------
18:02:44 CONSOLE: ERROR]: Current Thread: Timer-0
18:02:44 CONSOLE: ERROR]: PID: 37 | Suspended: false | Native: false | State: TIMED_WAITING
18:02:44 CONSOLE: ERROR]: Stack:
18:02:44 CONSOLE: ERROR]: java.lang.Object.wait(Native Method)
18:02:44 CONSOLE: ERROR]: java.util.TimerThread.mainLoop(Timer.java:552)
18:02:44 CONSOLE: ERROR]: java.util.TimerThread.run(Timer.java:505)
18:02:44 CONSOLE: ERROR]: ------------------------------
18:02:44 CONSOLE: ERROR]: Current Thread: Netty Epoll Server IO #2
18:02:44 CONSOLE: ERROR]: PID: 24 | Suspended: false | Native: false | State: RUNNABLE
18:02:44 CONSOLE: ERROR]: Stack:
18:02:44 CONSOLE: ERROR]: io.netty.channel.epoll.Native.epollWait(Native Method)
18:02:44 CONSOLE: ERROR]: io.netty.channel.epoll.EpollEventLoop.epollWait(EpollEventLoop.java:194)
18:02:44 CONSOLE: ERROR]: io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:219)
18:02:44 CONSOLE: ERROR]: io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116)
18:02:44 CONSOLE: ERROR]: java.lang.Thread.run(Thread.java:744)
18:02:44 CONSOLE: ERROR]: ------------------------------
18:02:44 CONSOLE: ERROR]: Current Thread: Netty Epoll Server IO #1
18:02:44 CONSOLE: ERROR]: PID: 23 | Suspended: false | Native: false | State: RUNNABLE
18:02:45 CONSOLE: ERROR]: com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:2526)
18:02:45 CONSOLE: ERROR]: com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2979)
18:02:45 CONSOLE: ERROR]: com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2968)
18:02:45 CONSOLE: ERROR]: com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3516)
18:02:45 CONSOLE: ERROR]: com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1986)
18:02:45 CONSOLE: ERROR]: com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2140)
18:02:45 CONSOLE: ERROR]: com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2626)
18:02:45 CONSOLE: ERROR]: com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2111)
18:02:45 CONSOLE: ERROR]: com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:1362)
18:02:46 CONSOLE: ERROR]: com.gmail.nossr50.database.SQLDatabaseManager.saveHuds(SQLDatabaseManager.java:1167)
18:02:46 CONSOLE: ERROR]: com.gmail.nossr50.database.SQLDatabaseManager.saveUser(SQLDatabaseManager.java:135)
18:02:46 CONSOLE: ERROR]: com.gmail.nossr50.datatypes.player.PlayerProfile.save(PlayerProfile.java:68)
18:02:46 CONSOLE: ERROR]: com.gmail.nossr50.listeners.PlayerListener.onPlayerQuit(PlayerListener.java:364)
18:02:46 CONSOLE: ERROR]: sun.reflect.GeneratedMethodAccessor597.invoke(Unknown Source)
18:02:46 CONSOLE: ERROR]: sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
18:02:46 CONSOLE: ERROR]: java.lang.reflect.Method.invoke(Method.java:606)
18:02:46 CONSOLE: ERROR]: org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:301)
18:02:46 CONSOLE: ERROR]: org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
18:02:46 CONSOLE: ERROR]: org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502)
18:02:46 CONSOLE: ERROR]: org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487)
18:02:46 CONSOLE: ERROR]: net.minecraft.server.v1_8_R2.PlayerList.disconnect(PlayerList.java:346)
18:02:46 CONSOLE: ERROR]: net.minecraft.server.v1_8_R2.PlayerConnection.a(PlayerConnection.java:848)
18:02:46 CONSOLE: ERROR]: net.minecraft.server.v1_8_R2.NetworkManager.l(NetworkManager.java:315)
18:02:46 CONSOLE: ERROR]: net.minecraft.server.v1_8_R2.ServerConnection.c(ServerConnection.java:145)
18:02:46 CONSOLE: ERROR]: net.minecraft.server.v1_8_R2.MinecraftServer.A(MinecraftServer.java:811)
18:02:46 CONSOLE: ERROR]: net.minecraft.server.v1_8_R2.DedicatedServer.A(DedicatedServer.java:368)
18:02:46 CONSOLE: ERROR]: net.minecraft.server.v1_8_R2.MinecraftServer.z(MinecraftServer.java:651)
18:02:46 CONSOLE: ERROR]: net.minecraft.server.v1_8_R2.MinecraftServer.run(MinecraftServer.java:554)
18:02:46 CONSOLE: ERROR]: java.lang.Thread.run(Thread.java:744)
18:02:46 CONSOLE: ERROR]: ------------------------------
18:02:46 CONSOLE: ERROR]: Current Thread: Server Infinisleeper
18:02:46 CONSOLE: ERROR]: PID: 14 | Suspended: false | Native: false | State: TIMED_WAITING
18:02:46 CONSOLE: ERROR]: Stack:
18:02:46 CONSOLE: ERROR]: java.lang.Thread.sleep(Native Method)
18:02:46 CONSOLE: ERROR]: net.minecraft.server.v1_8_R2.DedicatedServer$1.run(DedicatedServer.java:54)
18:02:46 CONSOLE: ERROR]: ------------------------------
18:02:46 CONSOLE: ERROR]: Current Thread: Snooper Timer
18:02:46 CONSOLE: ERROR]: PID: 10 | Suspended: false | Native: false | State: TIMED_WAITING
18:02:46 CONSOLE: ERROR]: Stack:
18:02:46 CONSOLE: ERROR]: java.lang.Object.wait(Native Method)
18:02:46 CONSOLE: ERROR]: java.util.TimerThread.mainLoop(Timer.java:552)
18:02:46 CONSOLE: ERROR]: java.util.TimerThread.run(Timer.java:505)
18:02:46 CONSOLE: ERROR]: ------------------------------
18:02:46 CONSOLE: ERROR]: Current Thread: Signal Dispatcher
18:02:46 CONSOLE: ERROR]: PID: 4 | Suspended: false | Native: false | State: RUNNABLE
18:02:46 CONSOLE: ERROR]: Stack:
18:02:46 CONSOLE: ERROR]: ------------------------------
18:02:46 CONSOLE: ERROR]: Current Thread: Finalizer
18:02:46 CONSOLE: ERROR]: PID: 3 | Suspended: false | Native: false | State: WAITING
18:02:46 CONSOLE: ERROR]: Stack:
18:02:46 CONSOLE: ERROR]: java.lang.Object.wait(Native Method)
18:02:46 CONSOLE: ERROR]: java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:135)
18:02:46 CONSOLE: ERROR]: java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:151)
18:02:46 CONSOLE: ERROR]: java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:189)
18:02:46 CONSOLE: ERROR]: ------------------------------
18:02:46 CONSOLE: ERROR]: Current Thread: Reference Handler
18:02:46 CONSOLE: ERROR]: PID: 2 | Suspended: false | Native: false | State: WAITING
18:02:46 CONSOLE: ERROR]: Stack:
18:02:46 CONSOLE: ERROR]: java.lang.Object.wait(Native Method)
18:02:46 CONSOLE: ERROR]: java.lang.Object.wait(Object.java:503)
18:02:46 CONSOLE: ERROR]: java.lang.ref.Reference$ReferenceHandler.run(Reference.java:133)
18:02:46 CONSOLE: ERROR]: ------------------------------
18:02:46 CONSOLE: [INFO] Startup script './start.sh' does not exist! Stopping server.
18:02:46 CONSOLE: [INFO] Stopping server