report error if file not found
report error if file not found

cambridgehackers/connectal,cambridgehackers/connectal,csail-csg/connectal,8l/connectal,chenm001/connectal,csail-csg/connectal,chenm001/connectal,csail-csg/connectal,hanw/connectal,hanw/connectal,8l/connectal,hanw/connectal,csail-csg/connectal,csail-csg/connectal,hanw/connectal,chenm001/connectal,cambridgehackers/connectal,cambridgehackers/connectal,8l/connectal,chenm001/connectal,8l/connectal,hanw/connectal,chenm001/connectal,cambridgehackers/connectal,8l/connectal