Problem starting .py script and webserver on Pi4/OS Bookworm

[ILAHWWINC]

I try to install pirowflo on a Pi4 / RaspberryOS Bookworm Full but it will not run. I can not connexct to the webserver. When i run the script from commadline i get this output.

pi@raspberrypi:~/pirowflo/src $ python3 waterrowerthreads.py -i s4 -b -a Traceback (most recent call last): File "/home/pi/pirowflo/src/waterrowerthreads.py", line 34, in from adapters.smartrow import smartrowtobleant File "/home/pi/pirowflo/src/adapters/smartrow/smartrowtobleant.py", line 4, in import gatt ModuleNotFoundError: No module named 'gatt'