title: InMobi SDK in Android Studio shows error for IMBanner
body: <p>I am integrating Inmobi SDK for ads in my android application. I have setup my inmobi account and have the application id from there. Below is the XML is use to setup the ad</p>
  
  <pre><code>&lt;com.inmobi.monetization.IMBanner
              android:layout_width="320dp"
              android:layout_height="50dp"
              android:id="@+id/banner"
              adSize="15"
              appId="xxxxxxxxxx"
              /&gt;
  </code></pre>
  
  <p>And of course i have replaced the XXXXX with my application id from the property in my Inmobi account. The first problem i observed was that <code>appId</code> is not being identified as a valid attribute. 
  Secondly if i try and do a <code>findViewById</code> in my activity I always get a <code>null</code> reference back.</p>
  
  <p>What am i missing in the implementation here? </p>