Actor not defined ???

[aurelVZ]

I am trying to run your Minic miner and i get this :
*** Python 3.8.2 (tags/v3.8.2:7b3ab59, Feb 25 2020, 22:45:29) [MSC v.1916 32 bit (Intel)] on win32. ***
*** Remote Python engine is active ***

*** Remote Interpreter Reinitialized ***
Traceback (most recent call last):
File "C:\Users\Zdenko\Downloads\Wireframe-49-main\manic-miner-source-code\manicminer.py", line 4, in
willy = Actor('willyr0',(400,300))
NameError: name 'Actor' is not defined

So i am wondering why is not defined in py3.8