The alias "LM/W3SVC/1/Root/XX" already exists. Please choose a different alias (zz)

Today i acrrous a errer about IIS. It say : XXX已存在请选择其他别名 we can soulation it from this step:
1."run-cmd"
2.In this console ,go to the folder "C:\Inetpub\AdminScripts". example: "c:" "c:\inetpub" "c:\inetpub\adminscripts"
3.Input this "cscript adsutil.vbs DELETE "W3SVC/1/ROOT/XX" "XX"is the exsit alias name. Then ,it will be run well!