node-red/packages/node_modules/@node-red/nodes/locales/en-US/common/98-unknown.html

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<script type="text/html" data-help-name="unknown">
    <p>This node is a type unknown to your installation of Node-RED.</p>
    <h3>Details</h3>
    <p><i>If you deploy with the node in this state, its configuration will be preserved, but
    the flow will not start until the missing type is installed.</i></p>
    <p>Use the <code>Menu - Manage Palette</code> option
    to search for and install nodes, or <b>npm install &lt;module&gt;</b> to
    install, any missing modules and restart Node-RED and reimport the nodes.</p>
    <p>It is possible this node type is already installed, but is missing a dependency. Check the Node-RED start-up
    log for any error messages associated with the missing node type.</p>
    <p>Otherwise, you should contact the author of the flow to obtain a copy of the missing node type.</p>
</script>