title: Angular material Could not find Angular Material core theme
body: <p>In my Angular2 project I install lastest material plugin from <a href="https://material.angular.io/guide/getting-started" rel="noreferrer">https://material.angular.io/guide/getting-started</a>. Next I add <code>@import '~@angular/material/prebuilt-themes/deeppurple-amber.css';</code> to my css file for my component. But in my console Angular shows this error:</p>
  
  <blockquote>
    <p>material.es5.js:148 Could not find Angular Material core theme. Most Material components may not work as expected. For more info refer to the theming guide: <a href="https://material.angular.io/guide/theming" rel="noreferrer">https://material.angular.io/guide/theming</a>` </p>
  </blockquote>
  
  <p>The material components not working.
  Whats wrong? </p>