Remove unused error class
Remove unused error class

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