"emulator: warning: opening audio input failed" displayed in the console while AVD is launching

``` "emulator: warning: opening audio input failed" ``` The above message is displayed in the console everytime an AVD is launching, and then no sound is coming out from the emulator. I have tried to delete the AVD and have created a new one again and again, but it didn't help with the problem. I have also searched on Google for many time, but I find nothing useful. It is really interesting that people tend to suggest to just ignore the problem because the AVD is still working fine without sound. But I am writing an Android App that related to sound, I really need a workable solution to make the AVD to "speak" again. Many thanks to you.