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Reply to Xcode 12 Beta "Cannot preview in this file"
I've been getting the same error for a while. I found first of all that I hadn't included all the .environmentalObjects that I should have, but then after I corrected that I still had the problem. After analysing the problem I removed the networking lawyer code (one file) and the problem was corrected. Later I added the code back and the problem returned, so I removed it again… and the problem stayed. Then I used Time Machine to restore the working code… and the problem still remained. What am I missing?
Aug ’20