oops, fix valueerror message [ci skip]
oops, fix valueerror message [ci skip]

DougBurke/astropy,dhomeier/astropy,funbaker/astropy,mhvk/astropy,bsipocz/astropy,mhvk/astropy,MSeifert04/astropy,mhvk/astropy,dhomeier/astropy,funbaker/astropy,saimn/astropy,saimn/astropy,saimn/astropy,DougBurke/astropy,AustereCuriosity/astropy,aleksandr-bakanov/astropy,aleksandr-bakanov/astropy,stargaser/astropy,StuartLittlefair/astropy,saimn/astropy,lpsinger/astropy,funbaker/astropy,AustereCuriosity/astropy,lpsinger/astropy,MSeifert04/astropy,pllim/astropy,funbaker/astropy,larrybradley/astropy,astropy/astropy,mhvk/astropy,mhvk/astropy,lpsinger/astropy,stargaser/astropy,bsipocz/astropy,stargaser/astropy,StuartLittlefair/astropy,larrybradley/astropy,StuartLittlefair/astropy,astropy/astropy,bsipocz/astropy,astropy/astropy,kelle/astropy,bsipocz/astropy,kelle/astropy,DougBurke/astropy,kelle/astropy,StuartLittlefair/astropy,astropy/astropy,MSeifert04/astropy,larrybradley/astropy,pllim/astropy,aleksandr-bakanov/astropy,saimn/astropy,MSeifert04/astropy,pllim/astropy,pllim/astropy,AustereCuriosity/astropy,stargaser/astropy,lpsinger/astropy,kelle/astropy,AustereCuriosity/astropy,pllim/astropy,dhomeier/astropy,StuartLittlefair/astropy,aleksandr-bakanov/astropy,lpsinger/astropy,larrybradley/astropy,dhomeier/astropy,dhomeier/astropy,astropy/astropy,kelle/astropy,larrybradley/astropy,AustereCuriosity/astropy,DougBurke/astropy