Why i give this error?

[_Vlad1101_]

[14:20:26 ERROR]: #!#!
[14:20:26 ERROR]: #!#! [Skript] Severe Error:
[14:20:26 ERROR]: #!#! Unexpected error while checking for a new version of Skript
[14:20:26 ERROR]: #!#!
[14:20:26 ERROR]: #!#! If you're developing an add-on for Skript this likely means that you have done something wrong.
[14:20:26 ERROR]: #!#! If you're a server admin however please go to http://dev.bukkit.org/server-mods/skript/tickets/
[14:20:26 ERROR]: #!#! and check whether this error has already been reported.
[14:20:26 ERROR]: #!#! If not please create a new ticket with a meaningful title, copy & paste this whole error into it,
[14:20:26 ERROR]: #!#! and describe what you did before it happened and/or what you think caused the error.
[14:20:26 ERROR]: #!#! If you think that it's a trigger that's causing the error please post the trigger as well.
[14:20:26 ERROR]: #!#! By following this guide fixing the error should be easy and done fast.
[14:20:26 ERROR]: #!#!
[14:20:26 ERROR]: #!#! Stack trace:
[14:20:26 ERROR]: #!#! javax.xml.stream.XMLStreamException: ParseError at [row,col]:[1,1]
Message: Premature end of file.
[14:20:26 ERROR]: #!#!     at com.sun.org.apache.xerces.internal.impl.XMLStreamReaderImpl.next(Unknown Source)
[14:20:26 ERROR]: #!#!     at com.sun.xml.internal.stream.XMLEventReaderImpl.nextEvent(Unknown Source)
[14:20:26 ERROR]: #!#!     at ch.njol.skript.Updater.getChangelogs(Updater.java:286)
[14:20:26 ERROR]: #!#!     at ch.njol.skript.Updater$2.run(Updater.java:210)
[14:20:26 ERROR]: #!#!     at java.lang.Thread.run(Unknown Source)
[14:20:26 ERROR]: #!#!
[14:20:26 ERROR]: #!#! Version Information:
[14:20:26 ERROR]: #!#!   Skript: 2.1.2
[14:20:26 ERROR]: #!#!   Bukkit: 1.9-SNAPSHOT
[14:20:26 ERROR]: #!#!   Minecraft: 1.9
[14:20:26 ERROR]: #!#!   Java: 1.8.0_111
[14:20:26 ERROR]: #!#!
[14:20:26 ERROR]: #!#! Running CraftBukkit: false
[14:20:26 ERROR]: #!#!
[14:20:26 ERROR]: #!#! Current node: databases: (config.sk, line 141)
[14:20:26 ERROR]: #!#! Current item: null
[14:20:26 ERROR]: #!#!
[14:20:26 ERROR]: #!#! Thread: Skript update thread
[14:20:26 ERROR]: #!#!
[14:20:26 ERROR]: #!#! End of Error.
[14:20:26 ERROR]: #!#!

AND

org.apache.commons.lang.UnhandledException: Plugin Skript v2.1.2 generated an exception while executing task 14
        at org.bukkit.craftbukkit.v1_9_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:56)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NoSuchMethodError: org.bukkit.Server.getOnlinePlayers()[Lorg/bukkit/entity/Player;
        at ch.njol.skript.Metrics.postPlugin(Metrics.java:347)
        at ch.njol.skript.Metrics$1.run(Metrics.java:235)
        at org.bukkit.craftbukkit.v1_9_R1.scheduler.CraftTask.run(CraftTask.java:71)
        at org.bukkit.craftbukkit.v1_9_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53)
        ... 3 more

 

[ShaneBee]

Please give us your code.