ImportError: No module named ttkwidgets.autocomplete

[PercevalSchopp]

I'm just trying to convert my single python file into a standalone app.
It uses Tkinter for the interface. I import tkinter in idle and it runs perfectly, but the terminal asks me to put a Capital "T" for compiling, which I changed.
But an error remains :

When I'm just doing this in a terminal.
python quiz.py py2app

ImportError: No module named ttkwidgets.autocomplete

I'm on mac os 10.11, I have no Idea what to do (and am quite a beginner, in coding and creating packages...).

Is there a solution or any workaround with another application ?
I need my little program to be on mac and windows (on window it works perfectly with pyinstaller)...