Hello,
Can you confirm you have the latest drivers of your camera installed? If it is a USB camera then I would also suggest you try other USB ports on your PC. Also, try using the camera alone or with other programs if it works fine then it must be an issue with Debut, in which case make sure to contact NCH Support to see if they can assist in resolving the issue.
You can create a support ticket through the link below:
- https://www.nch.com.au/support/index.html 
Good luck!