Code Sign Error in macOS Sierra Xcode 8 : resource fork, Finder information, or similar detritus not allowed

The error is from attributes inside your image files. This happened from our graphics designer saving images from photoshop with attributes.

Here is a simple command to find all of your png files and remove their attributes. Run this in your projects root directory from terminal. Clean and rebuild; problem solved.

find . -type f -name '*.png' -exec xattr -c {} \;

Copied from : stackoverflow thanks to Mark McCorkle