Not starting and message "Depress brake pedal!"

I have a Touareg 2008, which is not cranking or starting, while lights, and electronics get on. There is a message in the display panel which says "Depress brake pedal!". I have tested the battery and it is good. I had the computer reset and the car started, but after 1 or 2 weeks the problem happened again. I need to reset the computer to have the car start but it will work normally for another 1 or 2 weeks and then it won't start. Any help? Thanks