Error in the flash builder 4.5 when changing visible value in app-xml file

I am using flash builder 4.5 to create an app. when I changer the initial window - visible value in app- xml, I am not able to run the app. I get the following error

"Process terminated unexpectedly.

invalid application descriptor: Illegal value "true fals开发者_运维百科e" for application/initialWindow/visible.

Launch command details: "C:\Program Files\Adobe\Adobe Flash Builder 4.5\sdks\4.5.1\bin\adl.exe" -runtime "C:\Program Files\Adobe\Adobe Flash Builder 4.5\sdks\4.5.1\runtimes\air\win" "C:\Documents and Settings\preevara\Adobe Flash Builder 4.5\Test\bin-debug\Test-app.xml" "C:\Documents and Settings\preevara\Adobe Flash Builder 4.5\Test\bin-debug" "

why is this error thrown

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Just one year later but I've got the same issue and the solution is : check your xx-app.xml, this message appear when you have more than one tag. I've found this in my app.xml :

<autoOrients>false</autoOrients>
    <fullScreen>false</fullScreen>
    <visible>false</visible>
</initialWindow>