localhost:~ jingmz$ ng -version

 _                      _                 ____ _     ___
/ \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|

/ △ | '_ / _ | | | | |/ _ | '__| | | | | | |
/ | | | | (_| | |_| | | (_| | | | |___| | | |
/_/ __| |_|__, |__,_|_|__,_|_| ____|_____|___|

            |___/

Angular CLI: 6.0.8
Node: 10.5.0
OS: darwin x64
Angular: undefined
...

Package Version

@angular-devkit/architect 0.6.8 (cli-only)
@angular-devkit/core 0.6.8 (cli-only)
@angular-devkit/schematics 0.6.8 (cli-only)
@angular/cli <error>
@ngtools/webpack <error>
@schematics/angular 0.6.8 (cli-only)
@schematics/update 0.6.8 (cli-only)
rxjs 6.2.1 (cli-only)

typescript 2.7.2 (cli-only)

localhost:~ jingmz$ node -v

v10.5.0

node 升级v10.5.0 ，angular升级Angular CLI: 6.0.8 新建 angular工程 ng new ss 报错 ，This command can not be run inside of a CLI project.