Error: Local workspace file (‘angular.json’) could not be found

I just had the same problem.

It’s related to release v6.0.0-rc.2,

New configuration format. The new file can be found at angular.json (but .angular.json is also accepted). Running ng update on a CLI 1.7 project will move you to the new configuration.

I needed to execute:

ng update @angular/cli --migrate-only --from=1.7.4

This removed .angular-cli.json and created angular.json.

If this leads to your project using 1.7.4, install v6 locally:

npm install --save-dev @angular/[email protected]

And try once again to update your project with:

ng update @angular/cli --migrate-only --from=1.7.4

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