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TMSavePoint::GetProxyImpl Error with Power BI Premium Per User

Gilbert Quevauvilliers diagnoses an error:

I have been doing a lot of work recently using Power BI Premium Per User and recently I got the following error below when trying to update my fact table in Power Query.

“An unexpected error occurred (file ‘tmsavepoint.cpp’, line 1503, function ‘TMSavePoint::GetProxyImpl’)”

Read on to understand what this error means and how you can fix it. Do be sure to look out for the very important warning about 2/3 of the way in.