Build error "Multiple commands produce '.../GoogleCalendarAPIDemo'

[atluutran]

• My repo

Building the project in Xcode gives the following errors

Multiple commands produce '.../Library/Developer/Xcode/DerivedData/GoogleCalendarAPIDemo-ejkpqnhyhdxggpberzpmsvsuohkd/Build/Products/Debug-iphonesimulator/GoogleCalendarAPIDemo.app/GoogleCalendarAPIDemo'
Target 'GoogleCalendarAPIDemo' (project 'GoogleCalendarAPIDemo') has copy command from '.../github/fork/Google-Calendar-API-Demo/GoogleCalendarAPIDemo' to 
'.../Library/Developer/Xcode/DerivedData/GoogleCalendarAPIDemo-ejkpqnhyhdxggpberzpmsvsuohkd/Build/Products/Debug-iphonesimulator/GoogleCalendarAPIDemo.app/GoogleCalendarAPIDemo'
Target 'GoogleCalendarAPIDemo' (project 'GoogleCalendarAPIDemo') has link command with output 
'.../Library/Developer/Xcode/DerivedData/GoogleCalendarAPIDemo-ejkpqnhyhdxggpberzpmsvsuohkd/Build/Products/Debug-iphonesimulator/GoogleCalendarAPIDemo.app/GoogleCalendarAPIDemo'

I've tried to look at the build settings.