I don't know what items you scan so I have no idea why you might be scanning them. Are you just scanning random stuff because you can? Do you have a purpose for scanning these items? Are you even scanning the right codes? Is your finger over the camera lens? Does you device even have a camera? Do you have a data connection so your device can even search for related data for the code?
You have to supply some more data if you want help. I mean you didn't even say which app your using. How can anyone help you with no information except "unavailable". Come on help us alittle we are not long distances mind readers with clairvoyance.