cronjob not working on Ubuntu server <p>I am trying to execute a cronjob on ubuntu server, below are its code:</p> <pre><code>$cronjobs = array(); $cronjobs['cron_24hr_sendmessage'] = '* * * * *'; $cronjobs['cron_1hr_sendmessage'] = '* * * * *'; $cronjobs['cron_10mnt_sendmessage'] = '* * * * *'; $cronjobs['cron_for_insertdataforappointmentstemporary'] = '* * * * *'; $cronjobs['cron_for_delete2daysoldclientdata'] = '0 0 1 * *'; $cronjobs['send_call_for_appointment'] = '* * * * *'; $cronjobs['giveWarningMessage'] = '* * * * *'; $cronjobs['redialCallForUnsuccessfullAppointment'] = '3 * * * *'; $cronjobs['voidPaymentForUnsuccessfulAppointment'] = '0 1 * * *'; $cronjobs['counselorStatusUpdate'] = '* * * * *'; </code></pre> <p>Which work perfectly fine for me. Now i have added one more cronjob in it and now that new cron is not working properly</p> <p>New cron is :</p> <pre><code>$cronjobs['oneMinuteWarning']='* * * * *'; </code></pre> <p>And the codes are as follow :</p> <pre><code>$cronjobs = array(); $cronjobs['cron_24hr_sendmessage'] = '* * * * *'; $cronjobs['cron_1hr_sendmessage'] = '* * * * *'; $cronjobs['cron_10mnt_sendmessage'] = '* * * * *'; $cronjobs['cron_for_insertdataforappointmentstemporary'] = '* * * * *'; $cronjobs['cron_for_delete2daysoldclientdata'] = '0 0 1 * *'; $cronjobs['send_call_for_appointment'] = '* * * * *'; $cronjobs['giveWarningMessage'] = '* * * * *'; $cronjobs['redialCallForUnsuccessfullAppointment'] = '3 * * * *'; $cronjobs['oneMinuteWarning'] = '* * * * *'; $cronjobs['voidPaymentForUnsuccessfulAppointment'] = '0 1 * * *'; $cronjobs['counselorStatusUpdate'] = '* * * * *'; </code></pre> <p>i also tried it running by changing cron position and now new cron start working and all remaning cron stop working.</p>