# AIR \> NativeWindow Error - Flash CS4 IDE

**URL:** <https://forum.kirupa.com/t/air-nativewindow-error-flash-cs4-ide/297566>\
**Category:** flash\
**Created:** [October 5, 2009, 2:10pm UTC](https://forum.kirupa.com/t/air-nativewindow-error-flash-cs4-ide/297566 "2009-10-05T14:10:54Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![this](https://yyz1.discourse-cdn.com/flex011/user_avatar/forum.kirupa.com/this/32/669_2.png) [@this](https://forum.kirupa.com/u/this)\
**Post date:** [October 5, 2009, 2:10pm UTC](https://forum.kirupa.com/t/air-nativewindow-error-flash-cs4-ide/297566/1 "2009-10-05T14:10:54Z")

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Hi guys, im working on AIR App and when i create NativeWindow object and set it equal stage.nativeWindow the Flash Builder give-me an error, but have no error in Flash when i export the FLA file.

Error image attached.  
Anyone have idea about it ?