Gradle Sync failed could not find constraint-layout:1.0.0-alpha2
<p><strong>Problem :</strong></p>

<pre><code>Error:Could not find com.android.support.constraint:constraint-layout:1.0.0-alpha2.
Required by:
myapp:app:unspecified
</code></pre>

<p><strong>Background :</strong>
Android Studio 2.2 P 1</p>