I am getting an error while running voxl-camera-server it's not getting connected to TOF camera, the output is shown below.

voxl:/$ voxl-camera-server  
WARNING Failed to set priority, errno = 1
This may be because the FIFO scheduler is not available when running in a console.
It should work properly when run as a systemd background process on boot.
WARNING: failed to set scheduler
------ voxl-camera-server: Starting camera server
	Started Camera: tracking
	Started Camera: stereo
ERROR: Invalid Preview Format!
Encountered error starting camera: tof, exiting
	Stopped Camera: tracking
	Stopped Camera: stereo

can you tell me how to resolve this issue. below I have also attached voxl-camera-server.conf file.

voxl:/$ cat /etc/modalai/voxl-camera-server.conf 
{
	"version":	0.1,
	"cameras":	[{
			"name":	"tracking",
			"enabled":	true,
			"frame_rate":	30,
			"type":	"ov7251",
			"camera_id":	1,
			"ae_desired_msv":	60,
			"ae_filter_alpha":	0.600000023841858,
			"ae_ignore_fraction":	0.20000000298023224,
			"ae_slope":	0.05000000074505806,
			"ae_exposure_period":	1,
			"ae_gain_period":	1
		}, {
			"name":	"stereo",
			"enabled":	true,
			"frame_rate":	30,
			"type":	"ov7251",
			"camera_id":	2,
			"camera_id_second":	3,
			"ae_desired_msv":	60,
			"ae_filter_alpha":	0.600000023841858,
			"ae_ignore_fraction":	0.20000000298023224,
			"ae_slope":	0.05000000074505806,
			"ae_exposure_period":	1,
			"ae_gain_period":	1
		}, {
			"name":	"tof",
			"enabled":	true,
			"frame_rate":	-1,
			"type":	"pmd-tof",
			"camera_id":	0
		}]

Thanks!