Problem with Custom Scheduler

Hello Team I have created a custom scheduler following the below link:

http://support.sugarcrm.com/Documentation/Sugar_Developer/Sugar_Developer_Guide_7.7/Architecture/Job_Queue/Schedulers/Cr… 

Custom scheduler started running after following every step from the document,

but, the log says

Job 84bb04ab-b5b7-d67e-d298-57dfdd5c1603 (Testing Custom Scedduler) failed in CRON run