FileNotFoundError: [Errno 2] No such file or directory: '${cfg_file}'

[tesonhub]

I had this error while trying to run the code using a usb camera and cpu only. Is there a way to resolve this issue?

(alphapose) C:\Users\Teson\AlphaPose>python scripts/demo_inference.py --cfg ${cfg_file} --checkpoint ${trained_model} --outdir examples/res --vis --webcam 0
Traceback (most recent call last):
File "scripts/demo_inference.py", line 88, in
cfg = update_config(args.cfg)
File "c:\users\teson\alphapose\alphapose\utils\config.py", line 6, in update_config
with open(config_file) as f:
FileNotFoundError: [Errno 2] No such file or directory: '${cfg_file}'