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HTTP Error 500.19 - Application Pool Configuration Error

When attempting to access web applications, the following error is display in the browser window:

HTTP Error 500.19 - Internal Server Error
The requested page cannot be accessed because the related configuration data for the page is invalid.
The configuration section 'system.web.extensions' cannot be read because it is missing a section.

Product Line:
StruxureWare Power Monitoring 7.2.x
Power Monitoring Expert 7.0.1
ION Enterprise 6.0.x

IIS Manager

The application is running under an application pool configured with a non-compatible .NET version.

Perform the following steps:
  1. Launch the IIS Manager (exec 'inetmgr')
  2. Select the desired application (probably 'Server\Sites\Default web site\Your application name' from the tree on the left panel)
  3. Open the application settings (click 'Basic Settings' from 'Actions' in the right panel) and determine at the Application Pool.
  4. Now choose the appropriate action:
    • Change the application pool for the application (button select in 'Application Edit' form, then choose 'ASP.NET v4-0 Classic'). This change will effect just this application
    • Edit the application pool (probably Server\Application pools\DefaultAppPool rom the tree on the left) and set it to run under .NET Framework v4.0 . Be careful: this change will effect every application under this Application Pool
Different Application use different versions of .Net Below is a table detailing what the default version of .Net is used with different applications.
Application .Net Version
ION Enterprise 6.0 V2.0
PME 7.2 V4.0
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