I created the ASP.NET dll with one function that i need to use in Classic ASP page.
I used the below code for creating object in classic asp page
set
I just had this error appear on a site that had been running perfectly for years. It seems a DLL had somehow become unregistered. It was an unmanaged DLL so I was able to re-register it using regsvr32:
%SystemRoot%\Microsoft.NET\Framework\v2.0.50727\regsvr32 "C:\path\to\myAssembly.dll"
(Also see the difference between regasm and regsvr32)