The requested page cannot be accessed because the related configuration data for the page is invalid

Question

I am getting this error when I try to run an ASP.NET application without a web.config file.

The requested page cannot be accessed because the related

Answer 1

One reason could be the version of .NET framework (on ISS or application pool level) is different from the application one.

Another reason could be if there are modules used in your web.config which the current configuration of IIS doesn't 'recognize'. E.g. URL rewrite or other optional modules, which you have to explicitly enable before using.