title: `angular` how to fix this warning `Emitted value instead of an instance of Error`
body: <p>My <code>angular CLI</code> works fine. getting the images as well. But still, I am getting a <code>warning</code> like this:</p>
  <pre><code>WARNING in ./src/app/home/home.component.css
  (Emitted value instead of an instance of Error) postcss-url: C:\Projects\dhl-testing\src\app\home\home.component.css:4:3: Can't read file 'C:\Projects\dhl-testing\src\app\home\assets\images\dhlmoped.jpg', ignoring
  </code></pre>
  <p>and</p>
  <pre><code>WARNING in ./node_modules/raw-loader!./node_modules/postcss-loader/lib??embedded!./src/styles.css
  (Emitted value instead of an instance of Error) postcss-url: C:\Projects\dhl-testing\src\assets\css\sm\header.css:43:5: Can't read file 'C:\Projects\dhl-testing\src\assets\css\sm\assets\images\icon-user.png', ignoring
  </code></pre>
  <p>what are these warnings and how to fix them?</p>