ios - Code Signing Error Whenever I try replacing stock files in new SceneKit application

Question

So Xcode 8 was recently released and I'm still unsure as to what exactly might be causing this problem (it might be just the fact that it's a beta version of Xcode or perhaps that I'm somehow doing something incorrectly).

The problem at hand is that I'm trying to create a new SceneKit application and I'm currently messing around with the .scn files.

I created a .scn file, "hero.scn" inside of a "hero.scnassets" and also provided a .png file inside of the hero.scnassets folder by the name of "heroTexture.png"

The code normally provided by Xcode 8.0 beta 1 for this project in the "GameViewController.swift" file was edited as follows:

Original Code:

...
let scene = SCNScene(named: "art.scnassets/ship.scn")!
...
let ship = scene.rootNode.childNode(withName: "ship", recursively: true)!
ship.run(SCNAction.repeatForever(SCNAction.rotateBy(x: 0, y: 2, z: 0, duration: 1)))

Edited Code:

...
let scene = SCNScene(named: "hero.scnassets/hero.scn")!
...
let hero = scene.rootNode.childNode(withName: "hero", recursively: true)!
hero.run(SCNAction.repeatForever(SCNAction.rotateBy(x: 0, y: 2, z: 0, duration: 1)))

Error Received:

.../Xapp.app: resource fork, finder information, or similar detritus not allowed
Command /usr/bin/codesign failed with exit code 1

Conclusion of Question:

Why am I getting a signing error when all I've done is simply replaced files?

Sidenote: I know how to get the code signing issue to go away but that involves restarting the entire project (which I don't mind). The problem I face however is whenever I change the files, I get this error.

P.S: Here's a file structure just for ease.

Answer 1

Get rid of this build error in three easy steps:

1) delete the most current folder related to your app in DerivedData (~/Library/Developer/Xcode/DerivedData)

2) in the terminal, cd to the current project dir

3) run

xattr -rc .

to remove all extended attributes (usually related to image files previously edited in Photoshop)

rebuild your app!