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  1. PONo resource identifier found for attribute 'layout_weightSum' in package 'android'
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    <p>I have this simple LinearLayout that shows up fine in Graphical Layout but when I build the project I get this console error (What am I missing here?):</p> <p>No resource identifier found for attribute 'layout_weightSum' in package 'android'</p> <p>Here is the layout:</p> <pre><code>&lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" &gt; &lt;LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:layout_weightSum="3" android:baselineAligned="false" android:orientation="horizontal" &gt; &lt;LinearLayout android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" &gt; &lt;TextView android:id="@+id/tvSpine" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Spine"/&gt; &lt;/LinearLayout&gt; &lt;LinearLayout android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" &gt; &lt;TextView android:id="@+id/tvPage" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Page"/&gt; &lt;/LinearLayout&gt; &lt;LinearLayout android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" &gt; &lt;TextView android:id="@+id/tvThick" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Thick"/&gt; &lt;/LinearLayout&gt; &lt;/LinearLayout&gt; </code></pre> <p></p>
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