Bonjour a tous, j'essaye de tester un projet ionic en local, mais quand je fais ionic serve, le message suivant s'affiche :

"> ionic-app-scripts.cmd serve --address localhost --port 8100 --livereload-port
35729 --dev-logger-port 53703 --nobrowser

[INFO] Looks like @ionic/app-scripts isn't installed in this project.

       This package is required for this command to work properly. The package
       provides a CLI utility, but the ionic-app-scripts binary was not found in

       your PATH.

? Install @ionic/app-scripts? Yes
> npm.cmd i -D -E @ionic/app-scripts
[ERROR] Command not found: npm
"

j'ai fais le tour du net mais pas encore de solutions.