Bad 'Patches' in 9-Patch File

Question

I'm attempting to use the Draw9Patch tool from the Android SDK, but immediately upon opening my image with Draw9Patch it shows all of my image area as a 'Bad Patch.' I manually drew in the lines that define the stretchable areas, however I am unsure if this will work properly. Could someone explain why this specific image is not a 'good patch'? Other Stackoverflow answers to this question do not seem to correlate to my problem or I am not understanding them.