Added original error to thrown error in mega code
Added original error to thrown error in mega code

- the original error is not propagated up with the error we throw, so it
  can sometimes be difficult to see what's going on down the line

bitjson/Ghost,e10/Ghost,janvt/Ghost,TryGhost/Ghost,ErisDS/Ghost,bitjson/Ghost,TryGhost/Ghost,ErisDS/Ghost,ErisDS/Ghost,janvt/Ghost,TryGhost/Ghost,e10/Ghost