dualStereoChessboardCalibration.py - cameras not populating calibration screen"

Hey my python environment variables are set, but the issue that I am running into is that the expected 4 windows are not populating. Any ideas?

```
python dualStereoChessboardCalibration.py
No Calibration file found...
```
Above is the output and No calibration screen.

Thank you,

-Luseno64