Invalid value '${NODE_ENV:-production}' for the '--mode' option - Jasperserver-ui 8.0.2

Using Win10, and I run `yarn run build` under the /pro/jrs-ui-pro folder, I get the following error:

[webpack-cli] Invalid value '${NODE_ENV:-production}' for the '--mode' option
[webpack-cli] Expected: 'development | production | none'

I attempted to run the following command to set the NODE_ENV value:

set NODE_ENV=production

But nothing seems to work.  Any help is appreciated.