500 Internal server error when attempting to customize web interface. (186284)

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Title

500 Internal server error when attempting to customize web interface.
Description

When trying to customize the user form in the web interface via access the customization pages: - The "Click here to customize this form" at the bottom of the user form -Customization Tasks on the Customization page -Customization->Directory Objects menu item.
When clicking on any link for "Click here to customize this form", the following error is seen in the browser:
500 - Internal server error.
There is a problem with the resource you are looking for, and it cannot be displayed.
An error occured during the last operation
Error: Couldn't find type for class System.Web.WebPageTraceListener
Attached screen capture named 'System.Web.WebPageTraceListener error.jpg' shows error.
Cause

A possible reason for this error is if 'MySQL .NET connector' was installed with all of it's components on the ActiveRoles server (ARS) where the Web UI is also installed. The "Web Providers" component of the 'MySQL .NET connector' appears to cause issues with the ARS Web UI.
Resolution

Uninstall the 'MySQL .NET connector' then re-install selecting just the core components and the documentation if needed.
Attachments

System.Web.WebPageTraceListener error.jpg