This article describes why the “HTTP Error 500.19 – Internal Server Error” occures and how to solve it on the Windows Server.
Problem:
HTTP Error 500.19 – Internal Server Error
The requested page cannot be accessed becasue the related configuration data for the page is invalid.

Reason:
Some of the IIS features are not installed on the computer.
Solution:
- Go to the Server Manager
- Click on the Server Roles
- Under the Web Server (IIS) node check the nodes for the Application Development like in the picture:

- Scroll down within the Roles and check the Management Service

- Click on the Features
- Check the same nodes like in the picture below
- Click on the Next button

- Click on the Install

- Wait to complete the installation
- Click on the Close button

Finally restart the IIS:
- Right click on the IIS main node
- Stop the IIS

- Right click on the IIS main node
- Start the IIS

Now the web application should work correctly.