svn rollback

 open mac terminal    
  steps1:   pwd search project path.
 steps2:   svn log   check out  version number.
 steps3:   svn merge  -r current version number : will rollback version number    pwd search path.
 steps3:   svn status/diff  check out w hether  success.
 steps4:   svn ci -m'  rollback last verison  '  pwd search path
 steps5:   svn up/update
 okay, svn usually minor skil  going here  u already done it.