tools.scaffold: include vocab-root in error message.
tools.scaffold: include vocab-root in error message.

factor/factor,factor/factor,bpollack/factor,tgunr/factor,mrjbq7/factor,factor/factor,AlexIljin/factor,AlexIljin/factor,bpollack/factor,bpollack/factor,tgunr/factor,factor/factor,factor/factor,AlexIljin/factor,bpollack/factor,mrjbq7/factor,tgunr/factor,tgunr/factor,tgunr/factor,AlexIljin/factor,tgunr/factor,bpollack/factor,bpollack/factor,mrjbq7/factor,mrjbq7/factor,bpollack/factor,mrjbq7/factor,mrjbq7/factor,factor/factor,AlexIljin/factor,AlexIljin/factor,AlexIljin/factor