raising an error for missing binaries
raising an error for missing binaries


Former-commit-id: 4ed0c9722e8db04798d290a41f2ae88e32bd14aa
cboursnell/transrate,roryk/transrate,Blahah/transrate,roryk/transrate,Blahah/transrate,roryk/transrate,Blahah/transrate,cboursnell/transrate,cboursnell/transrate