Issue with REST api for GET report data

Hi 

Im trying to get individual report data by using this rest api

https://api.powerbi.com/v1.0/myorg/reports/{report_id}

and even i tried with 

GET https://api.powerbi.com/v1.0/myorg/groups/{group_id}/reports/{report_id}

what is group id?

in the place of group id i mentioned the id which u can see in screenshot

after mentioning this report id and group id in rest api im getting this which u san see in screenshot

may i know what is the issue 

can you help me out with this how can i resolve this issue?

Thanks

sai kumar