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    <p>In programming indexes often start at 0, so if you have 9 items, the highest index would be 8.</p> <p>The actual error is being thrown from some code within the library you are using</p> <pre><code>org.anddev.andengine.entity.Entity.onManagedDrawChildren(Entity.java:1008) </code></pre> <p>It is likely that you are changing the list in a separate thread whilst the library is also interacting with the list.</p> <hr> <p>From the <a href="https://code.google.com/p/andengine/source/browse/src/org/anddev/andengine/entity/Entity.java?r=9d1c7c0a5e53fce791b8411ac541fd74efc55f93" rel="nofollow noreferrer">gcode project</a>;</p> <pre><code> public void onManagedDrawChildren(final Camera pCamera) { final ArrayList&lt;IEntity&gt; children = this.mChildren; final int childCount = children.size(); for(int i = 0; i &lt; childCount; i++) { children.get(i).onDraw(pCamera); } } </code></pre> <p>As this is running in a separate thread, it is likely that you are removing an object from the children <code>ArrayList</code> while the loop is iterating. To fix this you should call your changes to the children <code>ArrayList</code> like jmr499485 explains in his answer.</p> <p><a href="https://stackoverflow.com/questions/18148097/java-lang-indexoutofboundsexception-invalid-index-13-size-is-13/18148283#18148097">java.lang.IndexOutOfBoundsException: Invalid index 13, size is 13</a></p> <p>The only item in your code I can see that would be causing this is the statement <code>questionText.detachSelf();</code> which you have used in many places. You should instead use;</p> <pre><code>runOnUpdateThread(new Runnable() { @Override public void run() { questionText.detachSelf(); } }); </code></pre>
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    1. CObut I didnt use anything like this :( here is the full class http://jquery404.com/file/GameScene.txt
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    2. COhere is the full project link http://jquery404.com/file/enfamil/premium/ @Robadob
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    3. COThat line is inside the library, it is called from the OpenGL render loop. I'll extend my answer
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