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

We need to change the config section applicationHost file

First Open folder path based on this

C:\Windows\System32\inetsrv\config

After open this path we will find applicationHost file.

Now select applicationHost file and right click on applicationHost file and open with Notepad to modify config section.

After open applicationHost file with Notepad

Go to <configSections> under that go to <sectionGroup name="system.webServer">

<section name="handlers" overrideModeDefault="Deny" />
change this value from "Deny" to "Allow"
<section name="modules" allowDefinition="MachineToApplication" overrideModeDefault="Deny" />
change this value from "Deny" to "Allow"

After change those values save your applicationhost file and run your application it will work for you.