i would like to test my whodunit.c-applicaton that I wrote for pset4 as described here http://cdn.cs50.net/2015/x/psets/4/pset4/pset4.html with check50. In the last psets there was always a code line for the proper call of check50 in the pset-description, like here http://cdn.cs50.net/2015/x/psets/2/pset2/pset2.html referring e. g. to check50 2014.fall.pset2.initials initials.c

Unfortunately this is not the case in pset4. I thought that this couldn't be to difficult to I used Google and found e. g. this check50 2014/x/pset4/whodunit whodunit.c (using / instead of .) and various other forms how people seem to work with check50. For whodunit in pset4 I have tried:
check50 2014/x/pset4/whodunit whodunit.c
check50 2014/x/pset4/bmp/whodunit whodunit.c
check50 2014.x.pset4.whodunit whodunit.c
check50 2014.x.pset4.bmp.whodunit whodunit.c
check50 2014/fall/pset4/whodunit whodunit.c
check50 2014/fall/pset4/bmp/whodunit whodunit.c
check50 2014.fall.pset4.whodunit whodunit.c
check50 2014.fall.pset4.bmp.whodunit whodunit.c
and unfortunately I got "Checking.. invalid ID" every time.

Do you have any idea what I am doing wrong?

Cheers

Cornelius