I am scratching my head for quite a few hours now. When i run the script:

select XEventData.XEvent.value('(data/value)[1]', 'varchar(max)') as DeadlockGraph

FROM

(select CAST(target_data as xml) as TargetData

from sys.dm_xe_session_targets st

join sys.dm_xe_sessions s on...

This has already been covered under the below link:-

http://www.sqlservercentral.com/scripts/Backup+%2F+Restore/30962/