Hi, MP-
Hmm, OK, that is odd. I just ran that command on my macOS, and it worked for me.
What is the output of afni_system_check.py -check_all on your computer?
--pt
ps: on a Message Board posting note, you can put multi-line code output between blocks of triple-backticks, like this:
```
code
more code
...
```
... and it will appear in nicely formatted monospace. More details are here. I actually edited the original question here to include backticks, so the provided terminal text was easier to read.