This error indicates that svnsync failed to release locks upon exit. You can release the locks with the command:
svn propdel svn:sync-lock --revprop -r 0 svn://targetrepository
[...] - bookmarked by 1 members originally found by NeonHurricane on 2008-07-24 Failed to get lock on destination repos http://dirk.net/2008/07/14/failed-to-get-lock-on-destination-repos/ - bookmarked by 3 members [...]
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August 20th, 2008 at 3:45 am
[...] - bookmarked by 1 members originally found by NeonHurricane on 2008-07-24 Failed to get lock on destination repos http://dirk.net/2008/07/14/failed-to-get-lock-on-destination-repos/ - bookmarked by 3 members [...]