Error Disk I/O in Quick Help Inspector Xcode9 : <p>I have been using Xcode recently when I noticed that the Quick Help tab wasn't showing what is used to show, it was just displaying</p>

<pre><code>Error
Domain=com.apple.DNTDocumentationSupport Code=0 "disk I/O error" UserInfo=
{NSLocalizedDescription=disk I/O error}
</code></pre>

<p>I looked up how to fix it, but I got no results.</p>

<p>Does anyone know how to fix this?</p>
