fatal error Xcode 9.4 beta - all red cannot access files - ios

PLEASE! can somebody, anybody out here lead me to as what this is about ? I was trying to access my pod within the terminal, and the next thing i know, this comes up when i opened my project. All the classes are Red - and i cannot click on any of them. Has this happened to anybody ?? Im new to iOS and i seriously hope i did not just delete or mess up a project ive been working on for a whole month. Please and thanks
Before this error - all of the check marks such as orientation - and such were all filled out. i seriously have no clue what to do, and i believe im messing things up even more by clicking around !!! SH**^%%TTT

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Audiokit 4.5 playgrounds opening, building, but no sound

In the past I've got previous versions of the playgrounds to work. However I can't get the new 2 day old version (4.5.0) from GitHub to work.
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I've resolved partly the issue - although not clear to me why this works - answer posted in case it's helpful for others.
Having tried downloading various versions, none of which worked, I tried to build many times. I noticed it seemed to be getting stuck on "Running ...." with spinning dial at top.
Researching this led me to a post re another playground with similar problem that said to untick and tick the links to the frameworks on the individual frameworks pages which I did.
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Command /usr/bin/ditto failed with exit code 1 on Xcode 7 beta 5

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Here is a link to a Dropbox where I put two screenshots of my the errors in my build log (Not a scam, I just can't post them here because StackOverflow is stupid and won't let me post images): https://www.dropbox.com/sh/l7l736nl2bfwcvt/AAA-e0-8FUpvqJmAEgwgA1nAa?dl=0
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Note that the "MapViewController.swift" file is a View Controller where I just use some basic MapKit features. As a beginner, I truly don't understand what "MapViewController.o" is, nor why Xcode is looking for it.
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xcode 5 can't see NSLog(s) from old iOS project

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As noted in the comment by #combinatorial, I had a debug statement hidden (so cleverly that I fooled myself) in the pch file. Thanks so much for helping me nail that down!

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