FTB direwolf20 1.5 v1.1.1

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  1. Entity's Block location: World: (-310,64,205), Chunk: (at 10,4,13 in -20,12; contains blocks -320,0,192 to -305,255,207), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
  2. Entity's Momentum: 0.00, -0.08, 0.00

Remove that block via deleting the region file or MCEDIT.
 
Well it is that chicken at that block not the block, but basically what your crash report is saying is something about that chicken does not have a value defined which should be defined so the server crashes.