Error in calling file ACG.h

[tyap4317]

I am currently trying to run the code onespin.cc on Visual Studio Code, but it seems the file ACG.h cannot be found, although I know it exists within the same folder as the other files being called.

quote:
[Running] cd "/Users/tonyapin/Desktop/qsd-mpi-develop/" && g++ onespin.cc -o onespin && "/Users/tonyapin/Desktop/qsd-mpi-develop/"onespin
onespin.cc:10:10: fatal error: 'ACG.h' file not found
#include "ACG.h"
^~~~~~~
1 error generated.