[otrs] About changing the default installation directory on SLE12

Hi everyone, To follow the installation instruction, the default installaton directory is /opt/otrs/...... Now I want to put the default directory to /srv/www/otrs... on SLE12, but it does not work and shows: Server error! The server encountered an internal error and was unable to complete your request. Error message: End of script output before headers: installer.pl If you think this is a server error, please contact the webmaster <%5bno%20address%20given%5d>. Error 500192.168.1.244 Apache/2.4.10 (Linux/SUSE) I edit apache2-httpd.include.conf and replace the path /opt/ by /srv/www/, it also does not work. Please could anyone tell me how I should do if I want to change the default installation directory. Thanks,