It's requesting version 2.3.1 of @angular/compiler-cli and refusing version 5.2.11

[A-lee-201]

Your global Angular CLI version (1.7.1) is greater than your local
version (1.0.4). The local Angular CLI version is used.

To disable this warning use "ng set --global warnings.versionMismatch=false".
Version of @angular/compiler-cli needs to be 2.3.1 or greater. Current version is "5.2.11".

[JuanAzar]

Same issue here. Were you able to solve it?

[doutzi]

Same issue here. I upgraded my local @angular/cli version from 1.0.4 to 1.7.4 and that fixed the problem for me.

[andrejonn31]

Simply upgrade your @angular/cli from version 1.0.4 to 1.7.1 by running on your project.

Though I would suggest you run this command below. this makes sure that @angular/cli is installed globally on your system and not just on your project. Run this very command using Command prompt:

npm i -g @angular/cli

This will install the latest version of @angular/cli.

Also run the command below so that you will be using the npm which matches the @angular/cli:

npm i