I copied check50 cs50/2017/x/initials/less like shown on pset2 and i get the "Checking. invalid ID" error. I added initials.c at the end and nothing.


1 Answer 1


Be sure to run update50 first, and then close and re-open any terminal windows! There's been a new release of check50 which will allow you to check with the syntax shown in the problem set specification.

  • yup! that did it. I could have sworen I did that before but I guess I didn´t. thanks Brian!
    – SarPach
    Aug 5, 2017 at 20:34

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