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VerifyError: Error #1014: 无法找到类 flash.text.engine::TextLine。

at global$init()

是为什么啊
这个是在eclipse里用的flex3插件版+sdk4.0+airsdk2.0
在fb4里面用的是
Please correct the following problem in the app.xml file for this application.

invalid application descriptor: descriptor version does not match runtime version

Launch command details: "D:\DevTools\Adobe Flash Builder 4\sdks\4.0.0_Air\bin\adl.exe" -runtime "D:\DevTools\Adobe Flash Builder 4\sdks\4.0.0_Air\runtimes\air\win" E:\work\AIR2AccelerometerDemo\bin-debug\AIR2AccelerometerDemo-app.xml E:\work\AIR2AccelerometerDemo\bin-debug

这是为什么啊