title: Failed to convert colour into a drawable
body: <p>So I am very new to android programming and I have an issue which I can't figure out at all. </p>
  
  <p>i want to make the background of my text the colour red which i was learning in a basic tutorial. 
  however, the problem is when i change the background colour, i get an error:</p>
  
  <blockquote>
    <p>"Rendering Problems Failed to convert red into a drawable"</p>
  </blockquote>
  
  <p>this is my code that i have written in the activity_main:</p>
  
  <pre><code>    &lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
      android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
      android:paddingRight="@dimen/activity_horizontal_margin"
      android:paddingTop="@dimen/activity_vertical_margin"
      android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity"&gt;
  
      &lt;TextView
          android:text="@string/hello_world"
          android:background="red"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content" /&gt;
  
  &lt;/RelativeLayout&gt;
  </code></pre>
  
  <p>this is my colours.xml file:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
      &lt;resources&gt;
  &lt;color name="Red"&gt;#E60000&lt;/color&gt;
  &lt;/resources&gt;`
  </code></pre>
  
  <p>i have even tried to change line 10 to <code>android:background="@color/red</code>
      or  <code>android:background="color/red</code> and even  <code>android:background="@android:color/red</code> but nothing seems to have worked. </p>
  
  <p>Would someone be able to help me fix this issue?</p>