eclipse android 报 “Unable to create sensors port:Unknown error”

下面是日志：

[2012-02-17 15:53:05 - AppDemo] Android Launch!
 [2012-02-17 15:53:05 - AppDemo] adb is running normally.
 [2012-02-17 15:53:05 - AppDemo] Performing pica.res.app.AppDemoActivity activity launch
 [2012-02-17 15:53:05 - AppDemo] Automatic Target Mode: Preferred AVD 'sdk2.3' is not available. Launching new emulator.
 [2012-02-17 15:53:05 - AppDemo] Launching a new emulator with Virtual Device 'sdk2.3'
 [2012-02-17 15:53:19 - Emulator] emulator: WARNING: Unable to create sensors port: Unknown error
 [2012-02-17 15:53:19 - Emulator] emulator: emulator window was out of view and was recentered
 [2012-02-17 15:53:19 - Emulator] 

模拟器能启动 ，模拟器里没有自己的项目，网上也查不到解决方案，有谁碰到过没？