print an error message if readFile fails to open file
print an error message if readFile fails to open file

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