bigg dogg

My front side marker light does not come on at night. The computer gives an error. I checked for voltage and there is 12volts there all the time. It been happening to the licence plate light for over 1 or 2 so I would just cancel the error. This started happening months after I installed a back up camera.
Any help would be helpful

bigg dogg

Light bulbs were blown, I replaced them and did a key reset thing. They're ok now.