開發遇到了問題，快來幫我

我已安裝了JAVA JDK,eclipse,android sdk

我新增好了虛擬器，按START→LAUNCH

後就會跑出

emulator: ERROR: bad config: virtual device directory lacks config.ini
emulator: could not find virtual device named 'em21'

em21=我的虛擬器名稱

 

os:win 7