What the heck is 9-Slice Scaling and why was my file failed for having it?
9-slice scaling lets you create movie clip symbols that scale
appropriately without distorting your image. 9-Slice scaling can be
useful but we'll leave it up to the buyer to make this change as
older versions of illustrator may have issues viewing your
image/file. Most likely, the box was accidentally selected in the
symbol option panel. Please uncheck the box or copy your image into
a new file, re-save, and resubmit.