npm install -g angular-cli不起作用

Question

Update:

Okay It seccussfully installed "npm install -g angular-cli" but now I got new error: "You cannot use the new command inside an angular-cli project." while trying to do: "ng new ang2pro" for making a new project.

C:\Users\armyTik\Desktop\angular2_projects\1>ng new pro-name
(node:6512) fs: re-evaluating native module sources is not supported. If you are using
 the graceful-fs module, please update it to a more recent version.
You cannot use the new command inside an angular-cli project.

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Original post:

It was working just fine yestarday and now I get the following errors even after reinstalling nodejs:

(The cmd is open with administrator privileges)

Answer 1

Make sure you have prerequisites installed on your machine.

angular-cli needs Node 4 or above & Typings V1 or greater

node -v should be greater than 4

node typings -v should be greater than 1

otherwise install typings using npm install typings -g

Answer 2

如果您使用的是Mac，请不要忘记命令前的sudo