After upgraded from 7.4.x to 7.5.1, many cron jobs are not running. These are the error messages in SuiteCRM log
Tue Feb 16 18:33:01 2016 [3][1][FATAL] Job 40391520-891d-52cd-87c4-56c2f96d4b37 (Run Nightly Mass Email Campaigns) failed in CRON run
Tue Feb 16 18:34:01 2016 [3][1][FATAL] Job 87a7a882-09f5-20bf-2225-56c2f923beb6 (Perform Lucene Index) failed in CRON run
Tue Feb 16 18:35:02 2016 [3][1][FATAL] Job 756fe85f-b701-5198-856c-56c2f9ef5d42 (Run AOW WorkFlow) failed in CRON run
Tue Feb 16 18:36:01 2016 [3][1][FATAL] Job d0fe21bb-1e10-d5da-b6d3-56c2fad60acd (Run Email Reminder Notifications) failed in CRON run
Tue Feb 16 18:37:02 2016 [3][1][FATAL] Job 4416abf6-b0e5-5e2e-1ddd-56c2fab518f6 (Check Inbound Mailboxes) failed in CRON run
Tue Feb 16 18:38:01 2016 [3][1][FATAL] Job 81a29d44-2613-20dc-c2c8-56c2fa3a6935 (Optimise AOD Index) failed in CRON run
Tue Feb 16 18:39:01 2016 [3][1][FATAL] Job 71d77ae0-c899-0035-a6b9-56c2faec43b5 (Run Nightly Process Bounced Campaign Emails) failed in CRON run
What is going on?