title: TypeError: Invalid PostCSS Plugin found at: plugins[0]
body: <p>I cloned this repo <a href="https://github.com/tailwindcss/setup-examples/tree/master/examples/nextjs" rel="noreferrer">https://github.com/tailwindcss/setup-examples/tree/master/examples/nextjs</a> then I updated <code>tailwind.config.js</code></p>
  <pre><code>  theme: {
      extend: {
        color: {
          primary: &quot;#730000&quot;,
          secondry: &quot;#efefef&quot;,
        },
      },
    },
    variants: {},
    plugins: [],
  };
  
  </code></pre>
  <p>then run the command <code>postcss css/tailwind.css -o generated.css</code>
  terminal throws an error <code>TypeError: Invalid PostCSS Plugin found at: plugins[0]</code>
  can anyone please help me to fix it. Thank you.</p>