I got this working with the help of this forum A robot with user name 'someName' is not defined in Orchestrator - #19 by vinod_sagar, check this if you have the same issue.
Thanks to @PrankurJoshi for all the assistance, I have got the Orchestrator running my tasks and scheduling is also working well. 
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sharazkm32
V_Roboto_V
Darshan_Sable
Bart_Simpson