title: Upgrade angular CLI to 8
body: <p>I have encountered the following errors when updating the version of <code>Angular Cli to 8</code>. </p>
  
  <pre><code>Could not find module "@angular-devkit/build-angular" from "C:\\Users\\AGT\\Desktop\\central8\\client".
  Error: Could not find module "@angular-devkit/build-angular" from "C:\\Users\\AGT\\Desktop\\central8\\client".
      at Object.resolve (C:\Users\AGT\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\@angular-devkit\core\node\resolve.js:151:11)
      at WorkspaceNodeModulesArchitectHost.resolveBuilder (C:\Users\AGT\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\@angular-devkit\architect\node\node-modules-architect-host.js:31:40)
      at ServeCommand.initialize (C:\Users\AGT\AppData\Roaming\npm\node_modules\@angular\cli\models\architect-command.js:135:55)
      at process._tickCallback (internal/process/next_tick.js:68:7)
      at Function.Module.runMain (internal/modules/cjs/loader.js:757:11)
      at startup (internal/bootstrap/node.js:283:19)
      at bootstrapNodeJSCore (internal/bootstrap/node.js:622:3)
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/Hq6JT.png" alt="enter image description here"></p>