Been using Xcode for a while with C++ set to sign locally (and objC before that). All worked ok. Looking to learn swift. Created a new, blank MacOS project, which starts compiling the template project (no code added yet by me) and fails with error "Command CodeSign failed with a nonzero exit code". It's set to automatically manage signing. I have valid development certificates. I've read lots of forum articles etc but unable to resolve. Error description "resource fork, Finder information, or similar detritus not allowed" but it's exclusively apple code at this stage so would not expect any non-compliant files to be involved. Any suggestions as currently I've fallen at the first hurdle on my Swift journey? Full codesign command line below: Signing Identity: "Apple Development: Steve Proctor (XXXXXXX)" /usr/bin/codesign --force --sign xxxxxx -o runtime --entitlements /Users/steve/Documents/dev/t1/Build/Intermediates.noindex/Previews/macos/t1/Intermediates.noindex/t1.build/Debug/t1.build/t1.app.xcent --timestamp\=none --generate-entitlement-der /Users/steve/Documents/dev/t1/Build/Intermediates.noindex/Previews/macos/t1/Products/Debug/t1.app /***/t1.app resource fork, Finder information, or similar detritus not allowed Command CodeSign failed with a nonzero exit code