Unable to load Website Administrative Tool

Hi, I went to cd c:\program files\iis express and run

iisexpress.exe /path: C:\Windows\Microsoft.NET\Framework\v4.0.30319\ASP.NETWebAdminFiles /vpath:"/asp.netwebadminfiles" /port:12345 /clr: 4.0 /ntlm

but nothing show up. No error. Nothing. It just return me back the new cmd command line.

I stop my firewall but still the same. But when I run just iisexpress.exe, it shows

Successfully registered URL "http://localhost:8080/" for site "WebSite1" applica
tion "/"
Registration completed for site "WebSite1"

Anyone knows the possible reasons?