http://*.com/questions/33315753/installation-failed-with-message-null-genymotion-error
Installation failed with message null.
It is possible that this issue is resolved by uninstalling an existing version of the apk if it is present, and then re-installing.
WARNING: Uninstalling will remove the application data!
Do you want to uninstall the existing application?
貌似是模拟器没启动完成就运行应用导致的；等模拟器启动完成再运行应用。
http://*.com/questions/15524185/could-not-access-the-package-manager-is-the-system-running-while-installing-and
https://code.google.com/p/android/issues/detail?id=62113