GetDataSbusetDownloadLinkFromRule

Trying to understand how this function works, getdatasubsetdownloadlinkfromrule, I can't find any documentation on Community about it.  I'm getting the following error:

 The system has encountered a problem

We're sorry! A problem occurred while processing your last request.

  •  Please contact the system administrator for more information.

Can someone point me in the right direction?

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