using mod script pipeline on ubuntu

thx I went over those instructions and got my build audacity to launch, when I launch it with the command “./audacity” like in the instructions it will open the audacity program. I can see the mod-script-pipe option in preferences and i set it to enabled. restarted audacity (checked that the mod-script-pipe is still enabled, then I download pipe_test.py from githube [ https://github.com/audacity/audacity/blob/master/scripts/piped-work/pipe_test.py ] download the file in my documents folder, and run it with sudo, but I get the error:

$ python3 pipe_test.py 
pipe-test.py, running on linux or mac
Write to  "/tmp/audacity_script_pipe.to.1000"
 ..does not exist.  Ensure Audacity is running with mod-script-pipe.

There is another thing I need to do in order to use mod-script-pipe in ubuntu aside from the instructions here right? : [ https://forum.audacityteam.org/t/building-audacity-2-4-2-on-ubuntu-20-04/57719/1 ] I think I need to download a mod-script-pipe file, add it to my audacity build folder, then re-run the build steps, any advice on where to find goof instructions on this