fix #403: make error.html more helpful
fix #403: make error.html more helpful
spacetelescope/asv,airspeed-velocity/asv,airspeed-velocity/asv,qwhelan/asv,airspeed-velocity/asv,qwhelan/asv,qwhelan/asv,spacetelescope/asv,airspeed-velocity/asv,pv/asv,pv/asv,qwhelan/asv,pv/asv,pv/asv,spacetelescope/asv,spacetelescope/asv