Error: The section could not be loaded. An error occurred during the request (status Code: 500). This could indicate a request to an invalid endpoint or a problem with the web server configuration when opening a constituent record

The section could not be loaded. An error occurred during the request (status Code: 500). This could indicate a request to an invalid endpoint or a problem with the web server configuration' occurs when opening Constituent record. 
Recycle Application pool and check .Net version installed. For version 2.7 and lower .Net 2.0 should be used.

If using version 2.7 or below, the .NET Framework settings in IIS should be set up similar to the below configuration:
Name: AppPool (can be whatever you want)
.NET Framework Version: v2.0
Managed Pipeline Mode: Integrated
Identity: NetworkService

Environment

 2.7.1654.82

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