find command giving incomplete sentence warning

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http://www.unix.com – Hi , I am adding a line in my shell scripts to delete all the old directory with the below command. On running this command it is coming out with the message find: incomplete statement Code: find /ersdg3/ERS/ERS_INPUT_LOGS/RIO/rio_archive -type d -mtime +47 -exec rm -rf {} What is wrong or missing in it. My os sun solaris 10 Guddu (HowTos)