runtime/observatory/lib/src/elements/general_error.html

<link rel="import" href="../../../../packages/polymer/polymer.html">
<link rel="import" href="nav_bar.html">
<link rel="import" href="observatory_element.html">

<polymer-element name="general-error" extends="observatory-element">
  <template>
    <link rel="stylesheet" href="css/shared.css">
    <nav-bar>
      <top-nav-menu last="{{ true }}"></top-nav-menu>
    </nav-bar>
    <div class="content-centered">
      <h1>Error</h1>
      <br>
      <div class="well">{{ message }}</div>
    </div>
  </template>
</polymer-element>

<script type="application/dart" src="general_error.dart"></script>