A bad error

Hi i have an error but i cant see from were dose it come from.Here is the error.

Code:

Caused by: java.lang.NoSuchMethodError: org.bukkit.event.block.BlockBreak          Event.<init>(Lorg/bukkit/block/Block;Lorg/bukkit/entity/Player;Ljava/util          /List;)V
 
        at com.gmail.nossr50.events.FakeBlockBreakEvent.<init>(FakeBlockB          reakEvent.java:13)
 
        at com.gmail.nossr50.m.blockBreakSimulate(m.java:130)
 
        at com.gmail.nossr50.skills.Skills.triggerCheck(Skills.java:427)
 
        at com.gmail.nossr50.listeners.mcBlockListener.onBlockDamage(mcBl          ockListener.java:295)
 
        at sun.reflect.GeneratedMethodAccessor77.invoke(Unknown Source)
 
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source          )
 
        at java.lang.reflect.Method.invoke(Unknown Source)
 
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLo          ader.java:301)
 
        ... 12 more

When this happens the servers laggs a lot ...

 

Please post more of the log (some lines before/after that error)
Do you have a plugin made by nossr50, or called skills?
if so, try disabling it.