Android Studio drawable selector unknown issue
<p>I seem to have a problem that I just do not know how to solve with Android Studio. The code worked find on Eclipse and the weird thing is that it also works on the Design preview window of Android Studio, but does not work when I execute the application on any real device.
The problem I'm having is with the drawable folder where I have a selector xml and a shape xml file. In my layout, I set the background of the button to the selector xml file. I noticed a very annoying red circle with an exclamation mark in the selector xml file where I specify the drawable to be the shape xml file. It doesn't state what the problem is, if any. It looks just like the following picture: 
<br><br>
<a href="https://i.stack.imgur.com/mIB3M.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/mIB3M.png" alt="enter image description here"></a></p>

<p><br>
The Design preview window shows the button as specified in the drawable xml files:
<a href="https://i.stack.imgur.com/uNX9B.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/uNX9B.png" alt="enter image description here"></a></p>

<p>Here is the code for my files:</p>

<p>bshape.xml</p>

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle" &gt;
    &lt;solid android:color="#FFAA33"/&gt;
    &lt;corners android:radius="5dp" /&gt;
&lt;/shape&gt;
</code></pre>

<p>button.xml (selector)</p>

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;selector xmlns:android="http://schemas.android.com/apk/res/android"&gt;
    &lt;!-- Normal state of button --&gt;
    &lt;item
        android:state_enabled="true"
        android:drawable="@drawable/bshape" /&gt;

&lt;/selector&gt;
</code></pre>

<p>myLayout (RelativeLayout)</p>

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:visibility="visible" &gt;

        &lt;Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="20sp"
            android:text="Button Test"
            android:textColor="#000000"
            android:background="@drawable/button"/&gt;

&lt;/RelativeLayout&gt;
</code></pre>

<p>I've made sure the xml files have the .xml extension. I've noticed several posts regarding missing the extension in the xml file.
This is really driving me nuts. I've spent about 3 hours attempting to solve this problem and I just don't know what it could be. Any help is extremely appreciated. Thank you in advanced!</p>

<p>Edit:
Below is a picture of all the files listed in my project.
<a href="https://i.stack.imgur.com/ZXwZB.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ZXwZB.png" alt="enter image description here"></a></p>