Follow these steps
#1. Clear de DerivedData folder
rm -rf ~/Library/Developer/Xcode/DerivedData
#2. Clean Xcode project
cmd + shift + k
#3. Close Xcode project, maybe even reboot the mac (if you like)
Try again.
The first step was the crucial step for me, but step 2 and 3 could help as well.
Salgado
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