ModuleNotFoundError in Pycharm while importing from existing folder

I'm running a Python project in Pycharm structured as shown in the image and I'm trying to perform the following import in embedder_cmd.py :from Neural_PM.clustering.clustering_experiment import run_clustering

I currently get the following error:
ModuleNotFoundError: No module named 'Neural_PM'

I've tried the solutions proposed in the previous answers but nothing seems to work for me.

Printing os.environ['PYTHONPATH'] currently shows my project path:C:\Users\Mark\PycharmProjects\pythonProject5

Project structure