Problem getting cron job work with php

Hi, Its being for weeks that i desperately getting a php script to work as a cron job. I got php as an apache module, so when execute the following command on the linux shell "lynx -dump http://xxxxxx/xxx/cron.phtml" it work fine but when i place it in the crontab i receive the following error message "Your terminal lacks the ability to clear the screen or position the cursor.". Could anybody tell me what's wrong. Thanks Lindsey