Importing Prophet causes pyinstaller to fail

Hello everyone, I have been using Fbprophet in order to build a sales prediction tool. The project is completed and I would now like to distribute this tool in order to make it accessible to other people, not as experienced with coding/python environments… Therefore I am using pyinstaller (on Windows) in order to generate an .exe file.

The generated .exe file does not work. After some debugging i figured that importing Fbprophet causes pyinstaller to fail.

The error is the following:

Traceback (most recent call last):
File "prova.py", line 2, in <module> 
  from fbprophet import Prophet, make_holidays
File "c:\users\-\appdata\local\conda\conda\envs\times\lib\site-packages\PyInstaller\loader\pyimod03_importers.py", line 627, in exec_module
    exec(bytecode, module.__dict__)
File "site-packages\fbprophet\__init__.py", line 8, in <module>
File "c:\users\-\appdata\local\conda\conda\envs\times\lib\site-packages\PyInstaller\loader\pyimod03_importers.py", line 627, in exec_module
    exec(bytecode, module.__dict__)
File "site-packages\fbprophet\forecaster.py", line 17, in <module>
File "c:\users\-\appdata\local\conda\conda\envs\times\lib\site-packages\PyInstaller\loader\pyimod03_importers.py", line 627, in exec_module
    exec(bytecode, module.__dict__)
File "site-packages\pystan\__init__.py", line 9, in <module>
File "c:\users\-\appdata\local\conda\conda\envs\times\lib\site-packages\PyInstaller\loader\pyimod03_importers.py", line 627, in exec_module
    exec(bytecode, module.__dict__)
File "site-packages\pystan\api.py", line 15, in <module>
File "c:\users\-\appdata\local\conda\conda\envs\times\lib\site-packages\PyInstaller\loader\pyimod03_importers.py", line 627, in exec_module
    exec(bytecode, module.__dict__)
File "site-packages\pystan\model.py", line 31, in <module>
ModuleNotFoundError: No module named 'Cython'

Does anyone know how to fix this problem?

Thank you for the help!