Getting the error when I run npm run build

[ravindrasingh22]

Getting the error when I run npm run build.

`root@4b7f1091aa62:/usr/src/app# npm run build
npm info it worked if it ends with ok
npm info using [email protected]
npm info using [email protected]
npm WARN invalid config https-proxy=""
npm WARN invalid config Must be a full url with 'http://'
npm info lifecycle [email protected]prebuild: [email protected]
npm info lifecycle [email protected]build: [email protected]

[email protected] build /usr/src/app
ng build -watch

You are running version v8.7.0 of Node.js, which is not supported by Angular CLI 8.0+.
The official Node.js version that is supported is 10.9 or greater.

Please visit https://nodejs.org/en/ to find instructions on how to update Node.js.
npm info lifecycle [email protected]~build: Failed to exec build script
npm ERR! code ELIFECYCLE
npm ERR! errno 3
npm ERR! [email protected] build: ng build -watch
npm ERR! Exit status 3
npm ERR!
npm ERR! Failed at the [email protected] build script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR! /root/.npm/_logs/2019-10-01T08_14_50_605Z-debug.log
root@4b7f1091aa62:/usr/src/app# ng
bash: ng: command not found`