9 patch image prevent build project android studio

Question

I am moving to Gradle build . but i have this error for a lot of 9-patch images .

Note the drawable is auto generated by http://android-holo-colors.com

Answer 1

My two cents,

I used photoshop to create my ninepatch and came across this error.

I had used the brush tool in brush mode with the black color to paint the border pixels (content and stretch)

The problem with the brush is that it also colors contiguous pixels with just a tiny amount of very transparent black so that you can't see it. Using the eraser in 1px crayon mode on all the pixel that should have been transparent worked for me.

When working on a nine patch in photoshop always use the brush tool in crayon mode