Improve diagnostic message when cpr header can't be opened.
Improve diagnostic message when cpr header can't be opened.

capitalaslash/libmesh,capitalaslash/libmesh,hrittich/libmesh,BalticPinguin/libmesh,90jrong/libmesh,hrittich/libmesh,90jrong/libmesh,jwpeterson/libmesh,capitalaslash/libmesh,jwpeterson/libmesh,dschwen/libmesh,jwpeterson/libmesh,BalticPinguin/libmesh,hrittich/libmesh,libMesh/libmesh,roystgnr/libmesh,libMesh/libmesh,roystgnr/libmesh,BalticPinguin/libmesh,capitalaslash/libmesh,BalticPinguin/libmesh,dschwen/libmesh,capitalaslash/libmesh,dschwen/libmesh,hrittich/libmesh,jwpeterson/libmesh,libMesh/libmesh,90jrong/libmesh,90jrong/libmesh,roystgnr/libmesh,hrittich/libmesh,jwpeterson/libmesh,dschwen/libmesh,libMesh/libmesh,dschwen/libmesh,roystgnr/libmesh,hrittich/libmesh,capitalaslash/libmesh,BalticPinguin/libmesh,BalticPinguin/libmesh,roystgnr/libmesh,jwpeterson/libmesh,libMesh/libmesh,capitalaslash/libmesh,roystgnr/libmesh,libMesh/libmesh,90jrong/libmesh,hrittich/libmesh,BalticPinguin/libmesh,libMesh/libmesh,90jrong/libmesh,jwpeterson/libmesh,90jrong/libmesh,capitalaslash/libmesh,roystgnr/libmesh,hrittich/libmesh,dschwen/libmesh,90jrong/libmesh,90jrong/libmesh,hrittich/libmesh,dschwen/libmesh,dschwen/libmesh,roystgnr/libmesh,jwpeterson/libmesh,libMesh/libmesh,BalticPinguin/libmesh