Nothing happens when I run sudo systemctl start vision_landing

[jashshah999]

When I run sudo systemctl start vision_landing, my webcam (video0) switches on for a second and goes back to sleep. There is no error or anything. I want to run this code first in SITL so I can test the landing. I have installed all the dependencies and when I came to this stage I had an issue. I am new to this so please help me out. Is there something I need to do before or after running this command? Nothing is showing up on my screen, nor is there an error.

Thanks!