Se tento di avviare un'applicazione d'esempio, mi ritorna questo:

[2014-07-09 16:02:09 - Prova] ------------------------------
[2014-07-09 16:02:09 - Prova] Android Launch!
[2014-07-09 16:02:09 - Prova] adb is running normally.
[2014-07-09 16:02:09 - Prova] Performing com.example.prova.MainActivity activity launch
[2014-07-09 16:02:09 - Prova] Automatic Target Mode: launching new emulator with compatible AVD 'Galaxy'
[2014-07-09 16:02:09 - Prova] Launching a new emulator with Virtual Device 'Galaxy'
[2014-07-09 16:02:10 - Emulator] emulator: warning: opening audio input failed
[2014-07-09 16:02:10 - Emulator]
[2014-07-09 16:02:10 - Prova] New emulator found: emulator-5554
[2014-07-09 16:02:10 - Prova] Waiting for HOME ('android.process.acore') to be launched...
[2014-07-09 16:04:09 - Prova] ------------------------------
[2014-07-09 16:04:09 - Prova] Android Launch!
[2014-07-09 16:04:09 - Prova] adb is running normally.
[2014-07-09 16:04:09 - Prova] Performing com.example.prova.MainActivity activity launch
[2014-07-09 16:04:09 - Prova] Automatic Target Mode: using existing emulator 'emulator-5554' running compatible AVD 'Galaxy'
[2014-07-09 16:04:09 - Prova] Uploading Prova.apk onto device 'emulator-5554'
[2014-07-09 16:04:10 - Prova] Installing Prova.apk...
[2014-07-09 16:04:21 - Prova] Installation error: Unknown failure
[2014-07-09 16:04:21 - Prova] Please check logcat output for more details.
[2014-07-09 16:04:21 - Prova] Launch canceled!

Qualcuno mi può aiutare grazie

Marzio