Auto update working copy SVN - get error "Host key verification failed"

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http://serverfault.com – I have a SVN server (UberSVN) and have a test server (Ubuntu 11.10). I followed the instruction link here for Auto update the working copy's with Subversion. Detail, I created a script in post-commit (the commit hook scripts) of Subversion to update svn to tesing server. My script as: ssh [email protected] -t -t 'cd /var/www/ThuChi && svn up' I tried to launch command as above in terminal then it's OK to run. I tried to launch test.sh with content is as above, then it's still OK to run. But, I add this script in post-commit script of svn (/opt/ubersvn/repositories/ThuChi/ (HowTos)