Error: An unknown error occurred during the request. - when viewing a custom data-list in the web shell

A user added a custom Datalist to the Fundraiser page that will load in the Smart Client but when viewed in the Web Shell they get Error:  An unknown error occurred during the request. This could indicate a request to an invalid endpoint or a problem with the web server configuration

Recreate the datalist in the webshell view. 

Environment

 2.94.1524, patch 39

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