Running a Duplicate constituent report returns the error: An unknown error occurred while processing the request on the server. The status code returned from the server was: 12002

When running the Duplicate constituent report, the process runs for about an hour before returning the following error:
An error has occurred in the script on this page.
Line: 2
Char: 15443
Error: Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server. The status code returned from the server was: 12002
Code: 0
Do you want to continue running scripts?

 

Download and install the latest version and patch, if applicable. 

Environment

 2.9.1001, patch 70
 3.0.516

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