'Seeing a Blank Error Message when trying to add a Dataset using RDLC Report Designer

I'm trying to add a Dataset to an RDLC report within Visual Studio 2019 Professional, and I get the following cryptic error window:

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We have hundreds of reports with hundreds of data sources. I've tried exiting and re-entering Visual Studio. I've uninstalled and reinstalled Microsoft's RDLC Report Designer.

Is there a workaround or a fix that will allow me to add a data source to this new report?



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