Not able to do the SVN update form linux command line: Its saying working copy is locked? How to resolve it?

[root@achappan htdocs_8081]# svn update importstatus.php
svn: Working copy '.' locked
svn: run 'svn cleanup' to remove locks (type 'svn help cleanup' for details)
[root@achappan htdocs_8081]#
[root@achappan htdocs_8081]# find . -name 'lock' -exec rm -v {} \;
removed `./.svn/lock'
removed `./course/.svn/lock'
removed `./course/report/stats/.svn/lock'
removed `./course/report/stats/db/.svn/lock'
removed `./course/report/.svn/lock'
[root@achappan htdocs_8081]# svn update importstatus.php
root@192.168.1.1's password:
At revision 811.
[root@achappan htdocs_8081]#