title: TypeError: Error #1009: Cannot access a property or method of a null object reference
body: <p>While running my code I get the error </p>
  
  <pre><code>TypeError: Error #1009: Cannot access a property or method of a null object reference.
      at com.yahoo.astra.fl.charts.series::LineSeries/drawMarkers()
      at com.yahoo.astra.fl.charts.series::LineSeries/tweenUpdateHandler()
      at flash.events::EventDispatcher/dispatchEventFunction()
      at flash.events::EventDispatcher/dispatchEvent()
      at com.yahoo.astra.animation::Animation/timerUpdateHandler()
      at flash.utils::Timer/_timerDispatch()
      at flash.utils::Timer/tick()
  </code></pre>
  
  <p>It does not specify any line where this error occurs.How this error can be solved?</p>