detail:
xcodebuild: error: Unable to read project 'DateToolsExample.xcodeproj' from folder '.../project/Carthage/Checkouts/DateTools/Examples/DateToolsExample'.
Reason: Project ../project/Carthage/Checkouts/DateTools/Examples/DateToolsExample/DateToolsExample.xcodeproj cannot be opened because it is missing its project.pbxproj file.
detail: