C# - Xamarin - how to debug a "using ..." error?
<p>I'm using MSVS2015Pro for Xamarin.</p>

<p>I downloaded the project: <a href="https://github.com/Clans/FloatingActionButton" rel="nofollow noreferrer">https://github.com/Clans/FloatingActionButton</a></p>

<p>But I'm getting an error on:</p>

<pre><code>using Clans.Fab;
</code></pre>

<p>It says:</p>

<blockquote>
  <p>Severity  Code    Description Project File    Line    Suppression State
  Error   CS0246  The type or namespace name 'Clans' could not be found (are you missing a using directive or an assembly reference?) FAB.Sample  D:\Xamarin\FloatingActionButton-Xamarin.Android\FAB.Sample\FloatingActionMenuBehavior.cs    5   Active</p>
</blockquote>

<p>as you can see on the following image:</p>

<p><a href="https://i.stack.imgur.com/oXhtC.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/oXhtC.png" alt="enter image description here"></a></p>

<p><strong>[EDIT]</strong></p>

<p>On the following image you have more details on errors:</p>

<p><a href="https://i.stack.imgur.com/KEVhX.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/KEVhX.png" alt="enter image description here"></a></p>

<p><strong>My question is:</strong></p>

<p>how can I debug these kind of errors?, I mean, not this one specifically but when there are <code>using errors</code> in general?. How can I know what: <code>Clans.Fab;</code> specifically is needed and from where do I have to download it?</p>

<p><strong>[EDIT]</strong></p>

<p>Then I did:</p>

<pre><code>PM&gt; Install-Package FAB.XamarinAndroid
</code></pre>

<p>and the errors disappeared and now I have 255 warnings.
Any idea on how to fix these warnings?</p>

<p>Below you have an screenshot with them:</p>

<p><a href="https://i.stack.imgur.com/depQy.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/depQy.png" alt="enter image description here"></a></p>

<p>Any idea on how to get rid of these warnings?</p>