icingaweb2/application/views/scripts/dashboard/show-configuration.phtml

<br/>
<div class="alert alert-error">
  <h4><i>{{WARNING_ICON}}</i>Saving Dashboard Failed</h4>
  <br/>
  <p>
    Your dashboard couldn't be stored (error: "<?= $this->exceptionMessage; ?>"). This could have one or more
    of the following reasons:
  </p>
  <ul>
    <li>You don't have permissions to write to the dashboard file</li>
    <li>Something went wrong while writing the file</li>
    <li>There's an application error preventing you from persisting the configuration</li>
  </ul>
</div>

<p>
  Details can be seen in your application log (if you don't have access to this file, call your administrator in this case).
  <br/>
  In case you can access the configuration file (config/dashboard/dashboard.ini) by yourself, you can open it and
  insert the config manually:
</p>
<p>
    <pre>
        <code>
<?= $this->escape($this->iniConfigurationString); ?>
        </code>
    </pre>
</p>