In Xcode 8.0 I am encountering a new error mesage whghn building an app that has been ok through previous versions of Xcode
/Users/myname/Library/Developer/Xcode/DerivedData/..........j/Build/Products/Debug-iphoneos/MyAppi.app: resource fork, Finder information, or similar detritus not allowed
Command /usr/bin/codesign failed with exit code 1
What is this "detritus"? I don't know where to find it, how to get rid of it, or why it is suddenly a problem for Xcode