Executing the ./diffutils_checking.sh

Hey all -
I’m wondering if I need to do some tweaking on this diffutils_checking.sh. I have installed my diffutils code under /u/ROCKET/diffutils and the checking.sh is under /u/ROCKET/diffutils/bin .
I do a cd to that dir and try to execute ./diffutils_checking.sh but I get FSUM5371 not found. I go in and edit the shell, changing the TOTAL_PATH from /rsusr/rocket to /u/ROCKET/diffutils and still have the error. Be gentle…I’m still very new to this stuff!
How do I get this working?
Thanks!
Deb