Error question

[MrTeddi]

So earlier today i got this error being spammed, i counted and i got 75 of this same error within 6 seconds

----8/11/2011 10:40:03 AM ----
Type: IndexOutOfRangeException
Source: mscorlib
Message: Index was outside the bounds of the array.
Target: Add
Trace: at System.Collections.Generic.List`1.Add(T item)
at MCDzienny.Player.manualChange(UInt16 x, UInt16 y, UInt16 z, Byte action, Byte type)
at MCDzienny.Player.HandleBlockchange(Byte[] message)

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So i was just wondering what it was

[xKiki00]

u count it o,o

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I have no idea what is tht error