title: How to solve (plugin postcss) Error: File to import not found or unreadable: smui-theme. Material UI Svelte project
body: <p>I am integrating <a href="https://sveltematerialui.com/" rel="noreferrer">Material UI</a> into a Svelte project.</p>
  
  <p>I follow everything from the <a href="https://github.com/hperrin/svelte-material-ui" rel="noreferrer">documentation</a>, but I get this error when running my project:</p>
  
  <pre><code>!] (plugin postcss) Error: File to import not found or unreadable: smui-theme.
  node_modules/@smui/tab/_index.scss
  Error: File to import not found or unreadable: smui-theme.
  </code></pre>
  
  <p>What can be the problem?</p>