Usually if something is not working, it has to do with permissions. The tool should have read/write access to the right folders (e.g. the tokenizer location). A good place to start looking when something appears not to work is the error log file of the web server. For Apache it is simply called ‘error_log’ and on Red Hat Linux it is located in the directory /var/log/httpd/. Also it might be a good idea to set the display_errors directive in the php.ini file to ‘On’ (it is ‘Off’ by default).