Calibration: No backround image for validation of camera external

Please provide the following info:
Hardware Platform: [DRIVE AGX Pegasus™ Developer Kit]
Software Version: [DRIVE Software 10]
Host Machine Version: [native Ubuntu 18.04]
SDK Manager Version: [1.0.1.5538]

Trying the calibration as per documentation.

I see a few of these in the output of calibration-graph-cli:

No backround image for validation of camera external

What does it mean?

Dear @gpu_power,
You can ignore it.