Unrecognized attribute 'preloadEnabled' on file \\?\C:\WINDOWS\...\app.config
You will get this error when the version of the IIS is below 8.
If you are getting this error for version lower than 7.5, it cannot be solved.
You need the version at least 7.5 to solve this issue.
The application pool configuration file is located in
You will get this error when on the above file, if you append the code preloadEnabled for node
'application' under 'sites' node as shown in Autostart-A-Website-At-Specific-Time-In-IIS.
For IIS version lower than 7.5, you definitely needs to remove the tag
preloadEnabled from application pool configuration file.
If it is version 7.5, then install the updated from this site Application Initialization Module for IIS 7.5.
For version 8 and above, this feature will be already installed.
For further clarification on when you do preloadEnabled follow the link.