The config file (.\ionic.config.json) is not valid JSON format
Goto this path- C:/Users/{your_username}/.ionicfind file ionic.config and delete it.
It will be auto-regenerated by the CLI.
It wasn't my ionic config file after all. It was a package.json and bower.json files. They did not have the dependencies correctly in place and the app name was in uppercase. After I fixed my dependencies, I got the command to work.
Run:
npm uninstall -g ionicRemove .ionic from user home folder
rm -Rf ~/.ionicThen, reinstall ionic:
npm i -g ionic