Power Monitoring Expert 9.x Error when opening Web applications HTTP Error 500.19 - Internal Server Error

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Issue
when opening web applications, the following error is displayed
HTTP Error 500.19 – Internal Server Error
HRESULT: 0x80070021

Product Line
StruxureWare Power Monitoring Expert

Environment
Power Monitoring Expert 9.x

Cause
The requested page cannot be accessed because the related configuration data for the page is invalid. This problem can occur when the specified portion of the IIS configuration file is locked at a higher configuration level.

Resolution
To resolve this problem, unlock the specified section, or do not use it at that level. To do this from a command prompt run the following commands.
%windir%\system32\inetsrv\appcmd unlock config -section:system.webServer/handlers
%windir%\system32\inetsrv\appcmd unlock config -section:system.webServer/modules
Then perform an iis reset using FA211981