Xcode quick tip: Copy failed during export or uploading to App Store

I have been working quite some time on version 1.3 of Copper, our Mac EDA application. Check it out if you didn’t know yet.┬áThis version brings the ability to import your own STEP models of parts to create wonderful 3D models of your PCB. And this feature also added a lot of (partly external) code to my project.

After archiving the project I wanted to upload it to the App Store. So I went in the Organizer of Xcode, selected the newly created archive and clicked on “Upload to App Store”. But, export failed. I got a strange “Copy failed” error with a hint to some logs. Reading these logs is hard. As I added various Frameworks and external libraries to my application I thought it must have been something to do with that. So, for many months I tried again and again, I ripped my project apart but I never really got this issue solved.

Looking at the logs I noticed that it points out:

...
2016-11-16 09:53:45 +0000 652253 bytes for ./Contents/Resources/woodTexture2.jpg
2016-11-16 09:53:45 +0000 /usr/bin/ditto exited with 1
2016-11-16 09:53:46 +0000 [MT] Canceled distribution assistant

(more…)

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