It seems to me Boujou's script or hip file is not updated to Houdini 10 so the camera does not have all the default parameters.
You can go to the Gear Icon of the camera's Parameters, Edit Rendering Parameters…, expand Mantra 10.0 > View and look for Enable Background Image & Background Image parameters. Select both parameters, click on the “->” button to add them to the camera and hit Accept.
Now, the Boujou camera will have the correct parameters.
That did it!!! Thank you so much!!