php image generating error cant display because it contain errors -

I am trying to change the color of a transparent image using the GD library, I am new to the GD library It collects the error Image Cant display because this error holds it is my code to create a png image

If you comment on the header function at the top, you get an error message about Can see that I do not see any error with that code on my image. Is this the whole code and tou tou before creating the image (or after)?