Implicit coercion of a value of type flexunit.flexui:TestRunnerBase to an unrelated type org.flexunit.runner:IRunner.

Hello all,

any idea for this error ?

Severity and Description    Path    Resource    Location    Creation Time    Id
1067: Implicit coercion of a value of type flexunit.flexui:TestRunnerBase to an unrelated type org.flexunit.runner:IRunner.    QuizzGame/src    QuizzTest.mxml    line 21    1253101842782    7688

in my project lib :

FlexUnit1Lib.swc

FlexUnit4.swc

fluint-1_2.swc

Hamcrest.swc

I created the QuizzTest.mxml    file and impossible to compile due to the error specified before :

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
                        xmlns="*"
                        creationComplete="onCreationComplete()"
                        xmlns:flexunit="flexunit.flexui.*">
    <!--
    -->
    <mx:Script>
        <![CDATA[
            import org.flexunit.runner.notification.IRunListener;
            import org.flexunit.runner.FlexUnitCore;

            import com.ao.quizzgame.test.CheckTestSuite;
            import flexunit.framework.TestSuite;
            private var flexUnitCore:FlexUnitCore;

            // Create the test suite and run the tests
            private function onCreationComplete():void
            {
                flexUnitCore=new FlexUnitCore();
                flexUnitCore.runRunner(testRunner);
                //This run statements executes the unit tests for the FlexUnit4 framework
                flexUnitCore.run(CheckTestSuite);
            }
        ]]>
    </mx:Script>
    <flexunit:TestRunnerBase id="testRunner"
                             width="100%"
                             height="100%"/>

</mx:Application >