Show a useful error when trying to load the incoming directory.
Show a useful error when trying to load the incoming directory.


Former-commit-id: 72042983c9cec00c57649de046d24a2cb89c29c3
mlocati/concrete5,concrete5/concrete5,MrKarlDilkington/concrete5,jaromirdalecky/concrete5,mlocati/concrete5,MrKarlDilkington/concrete5,triplei/concrete5-8,olsgreen/concrete5,rikzuiderlicht/concrete5,KorvinSzanto/concrete5,rikzuiderlicht/concrete5,deek87/concrete5,concrete5/concrete5,acliss19xx/concrete5,haeflimi/concrete5,KorvinSzanto/concrete5,MrKarlDilkington/concrete5,mainio/concrete5,a3020/concrete5,hissy/concrete5,acliss19xx/concrete5,biplobice/concrete5,KorvinSzanto/concrete5,biplobice/concrete5,mlocati/concrete5,hissy/concrete5,concrete5/concrete5,haeflimi/concrete5,olsgreen/concrete5,hissy/concrete5,jaromirdalecky/concrete5,haeflimi/concrete5,acliss19xx/concrete5,jaromirdalecky/concrete5,mainio/concrete5,haeflimi/concrete5,triplei/concrete5-8,mlocati/concrete5,deek87/concrete5,jaromirdalecky/concrete5,olsgreen/concrete5,biplobice/concrete5,biplobice/concrete5,hissy/concrete5,concrete5/concrete5,rikzuiderlicht/concrete5,mainio/concrete5,deek87/concrete5,triplei/concrete5-8,a3020/concrete5,deek87/concrete5