[android错误]Failed to install *.apk on device 'emulator-5554': timeout

[2014-06-26 15:35:42 - app] ------------------------------
[2014-06-26 15:35:42 - app] Android Launch!
[2014-06-26 15:35:42 - app] adb is running normally.
[2014-06-26 15:35:42 - app] Performing com.weibo.yamala.StatusActivity activity launch
[2014-06-26 15:35:43 - app] Automatic Target Mode: using existing emulator ‘emulator-5554‘ running compatible AVD ‘AVD_for_Nexus_S_by_Google‘
[2014-06-26 15:35:43 - app] Uploading app.apk onto device ‘emulator-5554‘
[2014-06-26 15:35:48 - app] Failed to install app.apk on device ‘emulator-5554‘: timeout
[2014-06-26 15:35:48 - app] Launch canceled!