Adding @angular/pwa not working on angular CLI

I'm trying to run the command ng add @angular/pwa --my project name so that I can implement service workers in my angular project but the error that I'm returned is "The add command requires to be run in an Angular project, but a project definition could not be found." If anyone can shed some light on what I can do to get past this error it would be much appreciated. I was upgrading from Angular CLI version 1.49. I have a feeling it has something to do with the angularcli.json file since the new version uses angular.json file.

This is also an exception when I try to use ng serve : Workspace needs to be loaded before it is used. Error: Workspace needs to be loaded before it is used

this is my version details:

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


Angular CLI: 7.0.1
Node: 10.12.0
OS: darwin x64
Angular: 5.2.11
... animations, common, compiler, compiler-cli, core, forms
... http, platform-browser, platform-browser-dynamic
... platform-server, router

Package                      Version
------------------------------------------------------
@angular-devkit/architect    0.10.1
@angular-devkit/core         0.3.2
@angular-devkit/schematics   7.0.1
@angular/cli                 7.0.1
@ngtools/webpack             1.10.2
@schematics/angular          7.0.1
@schematics/update           0.10.1
rxjs                         5.5.12
typescript                   3.1.1
webpack                      3.11.0

You are right regarding the new version using the updated angular.json file. See the following links on updating the cli, they should help: Angular Cli Error: The serve command requires to be run in an Angular project, but a project definition could not be found and https://github.com/angular/angular-cli/issues/12215#issuecomment-433593036

In my case I did the following:

1. Uninstall the cli: npm uninstall -g angular-cli
2. Clear the npm cache: npm cache verify
3. Reinstall the angular cli: npm install -g @angular/cli@latest

After installing the cli and generating your project, run the following inside the project directory where name is the name of the app as defined inside the angular.json file:

ng add @angular/pwa --project name

It is important to note that name is the name of the project as listed inside the angular.json file. Inside that file you should find a directive like this: "defaultProject": "app",. So in my case it will be:

ng add @angular/pwa --project app