add file name to debug message when checksum fails.
add file name to debug message when checksum fails.

CENDARI/atom,kyfr59/atom-cg35,artefactual/binder,artefactual/binder,kyfr59/atom-cg35,artefactual/binder,CENDARI/atom,artefactual/binder,Surfrdan/atom,kyfr59/atom-cg35,CENDARI/atom,artefactual/atom,artefactual/atom,artefactual/atom,Surfrdan/atom,Surfrdan/atom