Flex4 css error!

Question

I used flex sdk4.10, when open flash, it popup error as following:
ReferenceError: Error #1065: 变量 _class_embed_css_edit_gif__816087204_2003192454 未定义。
          at flash.display::MovieClip/nextFrame()
          at mx.managers::SystemManager/deferredNextFrame()[/Users/justinmclean/Documents/ApacheFlex4. 10/frameworks/projects/framework/src/mx/managers/SystemManager.as:286]
          at mx.managers::SystemManager/preloader_preloaderDocFrameReadyHandler()[/Users/justinmclean/ Documents/ApacheFlex4.10/frameworks/projects/framework/src/mx/managers/SystemManager.as:26 35]
          at flash.events::EventDispatcher/dispatchEventFunction()
          at flash.events::EventDispatcher/dispatchEvent()
          at mx.preloaders::Preloader/timerHandler()[/Users/justinmclean/Documents/ApacheFlex4.10/fram eworks/projects/framework/src/mx/preloaders/Preloader.as:525]
          at flash.utils::Timer/_timerDispatch()
          at flash.utils::Timer/tick()
Maybe it related with CSS, but i don't know the real reason, i don't know what's meaning about "_class_embed_css_edit_gif__816087204_2003192454"? Who can help me? Any suggestion will appreciate.

Answer 1

Thanks for the reply, i used -link-report to see whether this css gif compile to the swf, and i found that the xml has no this gif.
Finally, i found that if i change compile parameter "incremental" to false, the -link-report xml has the css defined looks like "<script name="_class_embed_css_edit_gif__816087204_2003192454.as"", and the flash will work well.
I don't know the real reason why "incremental" will impact the css? This issue only exists in sdk 4.5 later version, it is OK in sdk3.5 version. Why?