Eu tenho problema com a execução de um aplicativo android do eclipse no dispositivo Android real

quando clico em Executar apenas me mostre este erro: Erro de instalação:INSTALL_FAILED_UID_CHANGED

Logcat:

[2012-09-09 14:38:26 - SearchApp] Android Launch!
[2012-09-09 14:38:26 - SearchApp] adb is running normally.
[2012-09-09 14:38:26 - SearchApp] Performing com.example.MainActivity activity launch
[2012-09-09 14:38:26 - SearchApp] Automatic Target Mode: using device 'cff192abd7f551f'
[2012-09-09 14:38:26 - SearchApp] Uploading SearchApp.apk onto device 'cff192abd7f551f'
[2012-09-09 14:38:27 - SearchApp] Installing SearchApp.apk...
[2012-09-09 14:38:28 - SearchApp] Installation error: INSTALL_FAILED_UID_CHANGED
[2012-09-09 14:38:28 - SearchApp] Please check logcat output for more details.
[2012-09-09 14:38:28 - SearchApp] Launch canceled!