mber will look for an error template or route in the following
order:</p>
<ol>
<li><code>articles.overview-error</code></li>
<li><code>articles.error</code> or <code>articles-error</code></li>
<li><code>error</code> or <code>application-error</code></li>
</ol>
<p>If one of the above is found, the router will immediately transition into
that substate (without updating the URL). The "reason" for the error
(i.e. the exception thrown or the promise reject value) will be passed
to that error state as its <code>m