Failure [INSTALL_FAILED_INVALID_APK] on Flash builder 4.5.1 when debugging on real device

When I try to debub my Android 2.2.1 test app on my Samsung galaxy ace GT-S5830 in Flash builder 4.5.1 I allways get the following error 开发者_JS百科message at 57%, at this time flash builder is trying to install the air runtime.

Error occurred while installing the application:
    pkg: /data/local/tmp/Runtime.apk
Failure [INSTALL_FAILED_INVALID_APK]
1839 KB/s (6108444 bytes in 3.242s)

Running on desktop emulator works fine.

I'm using a windows 7 machine.

Please help...

Thanks