Eu costumava ter cli angular, mas por engano o instalei novamente com

npm install -g angular-cli

e agora quando eu corrong serve reclama:

It seems like you're using a project generated using an old version of the Angular CLI.
The latest CLI now uses webpack and includes a lot of improvements, include a simpler
workflow, a faster build and smaller bundles.

To get more info, including a step-by-step guide to upgrade the CLI, follow this link:
https://github.com/angular/angular-cli/wiki/Upgrading-from-Beta.10-to-Beta.12

quando tento criar um novo projeto usandong new em outro diretório, reclama que:

Cannot find module 'reflect-metadata'

Então qual é o problema?