If it was working fine before

Check the required permission on your application pool. Try to locate any other domain on same server and see if create object working fine or not

for more

https://support.microsoft.com/en-in/help/175804/prb-server-object-error-asp-0177-80040154-server-createobject

Not working before

In this case installed the required  plugin.

https://www.microsoft.com/en-in/download/

https://www.microsoft.com/en-in/download/details.aspx?id=3988