The Server Was Unable to Process The Request Due to an Internal Error

Error:

Message: The server was unable to process the request due to an internal error. For more information about the error, either turn on IncludeExceptionDetailInFaults (either from ServiceBehaviorAttribute or from the configuration behavior) on the server in order to send the exception information back to the client, or turn on tracing as per the Microsoft .NET Framework 3.0 SDK documentation and inspect the server trace logs.

This error usually occurs when the application uses web service or similar technologies.

Solution:
The solution may vary, depending on the issue faced. One thing for sure, there is one way to make sure the exact technical error of the message.

Open the web.config or app.config file of the application, then search for serviceDebug tag, then change the includeExceptionDetailInFaults attribute to true.

<serviceDebug includeExceptionDetailInFaults="false" />

Afterwards, reproduce the error. The exact technical error message should be displayed.