I'm at pset3 and this error has never happened to me and it's pretty strange to me.
When I 'make' the file in my IDE, I get no errors whatsoever and my program runs smoothly. However, when I upload my file to check50, I get this error:
Expecting an exit code of 0. ... but received the following on standard error instead — fifteen.c:20:10: fatal error: 'cs50.h' file not found #include ^1 error generated.
Does anyone have any reasoning behind this?