hi there
I resolved the probleme by installing ionic 2.2.3 and cordova 6.5.0 by excuting the command :
npm install -g ionic @2.2.3 cordova@6.5.0
but first of all you have to uninstall the previos version of ionic and cordova installed on you computer, you have just to execut this command :
npm uninstall cordova ionic
thank you and good luck