<PBXResourcesBuildPhase UUID=..> attempted to initialize an object with an unknown UUID
<p>I have taken SVN check-in for a project. Thereafter I have installed pod via <em>terminal</em>. After installation of pod there are few warning stating</p>

<pre><code>    &lt;PBXResourcesBuildPhase UUID=...&gt; attempted to initialise an 
    object with an unknown UUID.
</code></pre>

<p><a href="https://i.stack.imgur.com/bXDv3.png" rel="noreferrer"><img src="https://i.stack.imgur.com/bXDv3.png" alt="Screenshot for warning"></a>
What might be reason? <strong>Is this warning critical</strong>?</p>