Welcome back to Dos ! Command line is now much powerful than ever.
Please see this unit : https://wplms.io/unit/installing-app-packages/?id=641
The errors you're facing are exactly the same.
You need to install those npm packages.
If you bought the app, then note that there is a package.json file whihc you can replace with the one in your current WPLMS ionic project and then run command :
and everything will be downloaded and configured.