Better error message if user forgets with-ui
Better error message if user forgets with-ui

mcandre/factor,bpollack/factor,cataska/factor,mrjbq7/factor,mcandre/factor,dch/factor,bpollack/factor,bpollack/factor,sarvex/factor-lang,mrjbq7/factor,bpollack/factor,dch/factor,tgunr/factor,AlexIljin/factor,erg/factor,erg/factor,bjourne/factor,tgunr/factor,Keyholder/factor,bpollack/factor,bjourne/factor,slavapestov/factor,nicolas-p/factor,bjourne/factor,erg/factor,nicolas-p/factor,kingcons/factor,littledan/Factor,mcandre/factor,dch/factor,mrjbq7/factor,mrjbq7/factor,nicolas-p/factor,nicolas-p/factor,factor/factor,mcandre/factor,sarvex/factor-lang,nicolas-p/factor,erg/factor,ceninan/factor,sarvex/factor-lang,mcandre/factor,slavapestov/factor,dch/factor,sarvex/factor-lang,ceninan/factor,tgunr/factor,slavapestov/factor,nicolas-p/factor,sarvex/factor-lang,AlexIljin/factor,ceninan/factor,AlexIljin/factor,mrjbq7/factor,slavapestov/factor,mrjbq7/factor,bpollack/factor,ehird/factor,kingcons/factor,littledan/Factor,nicolas-p/factor,littledan/Factor,AlexIljin/factor,tgunr/factor,ehird/factor,erg/factor,sarvex/factor-lang,sarvex/factor-lang,mcandre/factor,cataska/factor,cataska/factor,slavapestov/factor,AlexIljin/factor,bjourne/factor,dch/factor,seckar/factor,factor/factor,seckar/factor,AlexIljin/factor,dch/factor,cataska/factor,littledan/Factor,AlexIljin/factor,mcandre/factor,bjourne/factor,Keyholder/factor,factor/factor,seckar/factor,slavapestov/factor,ehird/factor,Keyholder/factor,ceninan/factor,tgunr/factor,erg/factor,kingcons/factor,kingcons/factor,factor/factor,factor/factor,factor/factor,bjourne/factor,bpollack/factor,bjourne/factor,erg/factor,tgunr/factor,slavapestov/factor