com_error: (-2147221005, 'Invalid class string', None, None)

```python
osys = zos.OpticalSystem()
```
get this error message:
```
com_error: (-2147221005, 'Invalid class string', None, None)
```

and if I run 
```
EnsureModule('ZOSAPI_interfaces', 0,1,0)
```
I also get -2147221005 error.

what I tried:

* reinstall zemax
* reinstall anaconda
* reinstall pywin32, and run ```python \Script\pywin32_postinstall.py -install``` as admin