title: ERROR in : 'clr-icon' is not a known element:
body: <p>Running the following command:</p>
  
  <p><code>ng build --prod --base-href ./</code></p>
  
  <p>I get:</p>
  
  <pre><code>ERROR in : 'clr-icon' is not a known element:
  1. If 'clr-icon' is an Angular component, then verify that it is part of this module.
  2. If 'clr-icon' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message. ("spinner spinner-sm spinner-inverse" [style.display]="loading ? 'inline-block' : 'none'"&gt;&lt;/span&gt;
      [ERROR -&gt;]&lt;clr-icon clrSignpostTrigger shape="check" size="20" class="is-info" [style.display]="!loading &amp;&amp; req")
  </code></pre>
  
  <p>I'm on Angular 7 and Clarity 1.04.</p>
  
  <p>Extract from my <code>angular.json</code>:</p>
  
  <pre><code>        "styles": [
            "node_modules/@clr/icons/clr-icons.min.css",
            "node_modules/@clr/ui/clr-ui.min.css",
            "node_modules/prismjs/themes/prism-solarizedlight.css",
            "src/styles.css",
            "node_modules/lato-font/css/lato-font.min.css"
          ],
          "scripts": [
            "node_modules/core-js/client/shim.min.js",
            "node_modules/mutationobserver-shim/dist/mutationobserver.min.js",
            "node_modules/@webcomponents/custom-elements/custom-elements.min.js",
            "node_modules/web-animations-js/web-animations.min.js",
            "node_modules/prismjs/prism.js",
            "node_modules/prismjs/components/prism-typescript.min.js",
            "node_modules/@clr/icons/clr-icons.min.js"
          ]
  </code></pre>
  
  <p>Any ideas for how I can debug?</p>