Hi friends we downloaded the schduler from fallowing link http://www.phpjobscheduler.co.uk/ we chnged the configaration setting s in pjsfiles/configinc.php and inclueded the fallowing line include( "phpjobscheduler/firepjs.php"); in cron_email.php whcih sends email on particular time when we exectute the cron_email.php we are getting the fallowin error Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in C:\xampp\htdocs\sample\phpjobscheduler\pjsfiles\phpjobscheduler.php on line 33 we went throw the code in phpjobscheduler.php line n0 33 here phpJobScheduler phpJobScheduler_log tables are not created in database after executing the command cron_email.php that why we are getting the above error plz tell why tables are not creating