TypeError: __init__() got an unexpected keyword argument 'num_workers'

Hi, i’ve just started getting to grips with Nornir. I have created the config.yaml, hosts.yaml and groups.yaml files in notepad++ and have only have these 3 lines of code to start with in python:

from nornir import InitNornir
nr = InitNornir(config_file="C:/Users/<REMOVED>/Desktop/config.yaml")
nr.filter(site="uk").inventory.hosts.keys()

I’m getting these errors:

Traceback (most recent call last):
  File "C:/Users/<REMOVED>/PycharmProjects/test_project/nornir_test.py", line 7, in <module>
    nr = InitNornir(
  File "C:\Users\<REMOVED>\PycharmProjects\test_project\venv\lib\site-packages\nornir\init_nornir.py", line 66, in InitNornir
    config = Config.from_dict(**kwargs)
  File "C:\Users\<REMOVED>\PycharmProjects\test_project\venv\lib\site-packages\nornir\core\configuration.py", line 279, in from_dict
    core=CoreConfig(**core or {}),
TypeError: __init__() got an unexpected keyword argument 'num_workers'

My config.yaml file looks like this:

---
core:
  num_workers: 10

inventory:
  plugin: nornir.plugins.inventory.simple.SimpleInventory
  options:
    host_file: "C:/Users/<REMOVED>/Desktop/hosts.yaml"
    groups_file: "C:/Users/<REMOVED>/Desktop/groups.yaml"

I have even tried starting it without the config file:

from nornir import InitNornir
nr = InitNornir(
    core={"num_workers": 100},
    inventory={
        "plugin": "nornir.plugins.inventory.simple.SimpleInventory",
        "options": {
            "host_file": "inventory/hosts.yaml",
            "group_file": "inventory/groups.yaml"
        }
    }
)

But STILL nothing, this isn’t something stupid “Windows thing” is it because quite frankly i’m baffled at the moment.

Any help with this would be much appreciated, go easy i’m just a newbie with Nornir