title: error: No resource identifier found for attribute 'layout_alignStart' in package 'android'
body: <p>I have this project imported from another source and there were problems showing. From one of my layouts, it says "error: No resource identifier found for attribute 'layout_alignStart' in package 'android'" at:</p>
  
  <pre><code>&lt;ProgressBar
          style="@android:style/Widget.ProgressBar.Small"
          android:layout_gravity="center_vertical"
          android:layout_alignStart="@id/imageFrame"
          android:layout_width="fill_parent"
          android:layout_height="wrap_content"
          android:indeterminate="true"
          android:id="@+id/progressBar"
          android:layout_alignParentTop="true"
          android:layout_marginTop="15dp"
      /&gt;
  </code></pre>
  
  <p>where imageFrame is an ID of a FrameLayout.</p>
  
  <p>My project build target is API Level 17 and in my manifest:</p>
  
  <pre><code>    &lt;uses-sdk
      android:minSdkVersion="11"
      android:targetSdkVersion="11" /&gt;
  </code></pre>
  
  <p>In my menu xml file:</p>
  
  <pre><code>    &lt;item
      android:id="@+id/menu_settings"
      android:orderInCategory="100"
      android:showAsAction="never"
      android:title="@string/menu_settings"/&gt;
  </code></pre>
  
  <p>And note this was not literally "imported" but added through "Android Project from Existing Code"
  I'm also using Eclipse for this project.</p>