HTTP Error 500.0 - Internal Server Error Calling LoadLibraryEx on ISAPI filter "C:\Windows\Microsoft.NET\Framework\v4.0.30319\\aspnet_filter.dll" failed

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Issue
When launching Web Applications in StruxureWarePower Monitoring Expert, the following HTTP error page shows up when trying to open http:\\servername\web

HTTP Error 500.0 - Internal Server Error

Calling LoadLibraryEx on ISAPI filter "C:\Windows\Microsoft.NET\Framework\v4.0.30319\\aspnet_filter.dll" failed

Product Line
Power Monitoring Expert 7.2
Power Monitoring Expert 8.x
Power Monitoring Expert 9.x
Power Monitoring Expert 2020
Power Monitoring Expert 2021

Environment
Web Applications
IIS

Cause
The ISAPI path has an extra '\' character.

Resolution
1. Open Internet Information Services
2. Click on the computer name on the left list.
3. Double-click on ISAPI Filters
4. Modify the ASP.NET_4.0_32bit executable path to not include a double '\'

Example of correct path information:

5. Close IIS Manager and restart IIS from the command prompt (Start -> Run -> iisreset)