Erro ao instalar o ionic

Ionic Framework
1

Ao instalar ionic
C:\Users\Guabiraba> npm install -g ionic ou npm install -g @ionic/cli
aparece o erro:
npm WARN deprecated ionic@5.4.16: The Ionic CLI now uses :sparkles: @ionic/cli :sparkles: for its package name! :point_right: https://twitter.com/ionicframework/status/1223268498362851330
npm ERR! Unexpected end of JSON input while parsing near ‘…4N5FdhiNtQRG\nhWomw5f’

npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\Guabiraba\AppData\Roaming\npm-cache_logs\2020-03-29T15_57_51_342Z-debug.log

2

The correct command is

npm install -g @ionic/cli
3

Foi esse que usei. Diretamente da página: https://ionicframework.com/getting-started.