emulator: ERROR: the user data image is used by another emulator. Aborting

By developing Android application under Eclipse is a wonderful thing. One thing bothers some developers is an error message “emulator: ERROR: the user data image is used by another emulator. aborting.” There are tons of the postings and the answers by searching this error message. In my opinion, those solutions are too complex and handy. Then one solution comes to my eyes, http://www.cnblogs.com/over140/archive/2010/08/06/1793264.html. His method is quite simple – just reset adb. Simple, right?