Trying to run Mozilla TTS on AWS, Dockerfile appear to be broken

I am trying to run inference on AWS P2x.large AMI for deep learning using docker, it appeared to have built correctly but when I try to run it I got the following error:

nvidia-docker run -it --rm -p 5002:5002 mozilla-tts
Traceback (most recent call last):
File “server/”, line 6, in
from TTS.server.synthesizer import Synthesizer
ModuleNotFoundError: No module named ‘TTS’