I was following this guide <https://realpython.com/blog/python/setting-up-a-simple-ocr-server/> and got to the part where I run cli.py `python flask_server/cli.py` but I get 

```
python cli.py
Traceback (most recent call last):
  File "cli.py", line 3, in <module>
    import pytesseract
ImportError: No module named pytesseract

```

How can I solve this ? 

I also saw that I have multiple versions of python. I have linux-kali installed with the latest updates. 

Something else: he runs the command like `python flask_server/cli.py`- where is that flask\_server located ? I simply ran it like `python cli.py`(I was in some directory in which I created the file).