Well, you can try another way:
1) First, open the DDMS via Window->Open Perspective->DDMS
under Eclipse.
2) Then open BlueStacks App Player.(leave it opens)
3) After that switch back to Eclipse and you should notice there're two emulator under the Device
tab.
Then click Reset adb
under the small triangle at the Device
tab.
After a few seconds, the another one emulator will disappear and you can proceed to the next step.
4) Then return back through Window->Open Perspective->Java
under Eclipse.
5) Select your project and right click on it, choose Debug As->Debug Configurations
6) Under Android Application
select your configuration or create a new one. On the Target
tab choose Always prompt to pick device
After this, select Apply
then Debug
.
7) Then select BlueStacks emulator in the prompt window, and finally select OK
.
Alternatively, you can also open the BlueStacks App Player before Eclipse using the above steps(with minor changes).
For more info, visit the below links.(However, in Chinese...)
http://www.cnblogs.com/hbbbs/archive/2012/10/30/2746950.html
http://www.cnblogs.com/hbbbs/archive/2012/10/30/2746979.html
Hopefully this will help you.