I have blogged about this in November 2013 which is almost 2 years ago.

run as admin (windows key + X) command prompt as admin

C:\Program Files (x86)\IIS Express\iisexpress.exe" /path:C:\Windows\Microsoft.NET\Framework\v4.0.30319\ASP.NETWebAdminFiles /vpath:"/webadmin" /port:12345 /clr:4.0 /ntlm

http://localhost:12345/webadmin/default.aspx?applicationPhysicalPath=C:\Path\to\your\webformcode\&applicationUrl=/

and then there was this stacktrace and error… I have not had this issue before. It was since the 4.6 framework was installed.

Thankfully I found this stackoverflow answer which resolves it:

open "C:\Windows\Microsoft.NET\Framework\v4.0.30319\ASP.NETWebAdminFiles\App_Code\WebAdminPage.cs"

in notepad++ and ctrl+g (go to) line 989 and give the string appId the value of “1” instead of the stringutil.blabla

save and reload the page.

No more error on:

StringUtil.GetNonRandomizedHashCode(String.Concat(appPath, appPhysPath)).ToString("x", CultureInfo.InvariantCulture);

Good luck!

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