HTTP Error 500.24 - Internal Server Error An Asp.NET setting has been detected that does not apply in Integrated managed pipeline mode

Question

I have webpage which has gridview, one of the columns will have a image. When clicked on image it will open the PDF saved on the web server. It was working fine but I am getting

Answer 1

I changed in my application pool running the site. "Managed Pipline Mode" from integrated to classic.

right click on your application pool -> basic settings.