TypeError: Cannot read property 'Device' of null

[eric at aisling-technologies.com]

I am using Google's Postman to test API calls.  I am attempting to do a
connection request where I can refresh a parameter, and eventually graph it

 

My connection request.

 
http://###.###.###.###:7557/devices/1C497B-B2338%2D168-GMC170828000679/tasks
?connection_request

My query.

{"name":"refreshObject",
"objectName":"InternetGatewayDevice.SystemConfig.Status.ModemStatus.RSRP"}

 

When I run it I get the following error.

              TypeError: Cannot read property 'Device' of null

 

Thoughts?

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